影响因子（Impact Factor, IF）是衡量学术期刊影响力的重要指标，由科学引文索引（Science Citation Index, SCI）基于期刊论文被引用频率计算得出。通常，影响因子越高，表明该期刊的学术影响力和论文质量越高。例如，Cell的影响因子约为40，而《中国科学》则约为0.2。以下为生命科学领域主要SCI期刊的影响因子列表（数据基于历史统计，仅供参考）：
高影响因子期刊（IF > 20）：Cell (40.481)、Annual Review of Cell Biology (30.548)、Nature Genetics (28.543)、Nature (27.074)、Immunology Today (25.228)、New England Journal of Medicine (22.412)、Science (21.911)。
中高影响因子期刊（IF 10-20）：Trends in Neurosciences (19.972)、Genes & Development (18.793)、Lancet (17.490)、Trends in Biochemical Sciences (17.217)、Neuron (16.619)、Immunity (15.354)、Journal of Experimental Medicine (15.126)、Brain Research Reviews (13.962)、EMBO Journal (13.505)、Federation Proceedings (13.404)、Trends in Cell Biology (12.748)、Journal of Cell Biology (12.480)、Annual Review of Physiology (12.059)、Archives of General Psychiatry (11.155)、PNAS (10.520)、Molecular and Cellular Biology (10.498)、Trends in Genetics (10.446)、Journal of the National Cancer Institute (10.165)、Annals of Internal Medicine (9.920)、Molecular Biology of the Cell (9.376)、American Journal of Human Genetics (9.262)、Development (9.162)。
中等影响因子期刊（IF 5-10）：Reviews of Physiology Biochemistry and Pharmacology (8.833)、Circulation (8.822)、Current Opinion in Immunology (8.792)、Journal of Clinical Investigation (8.788)、Human Gene Therapy (8.728)、Blood (8.569)、Cancer Research (8.206)、Journal of Neuroscience (8.205)、Gastroenterology (8.203)、Gene Therapy (8.063)、Circulation Research (8.002)、Oncogene (7.991)、Protein Profile (7.600)、Journal of Immunology (7.412)、Journal of Biological Chemistry (7.385)、Current Opinion in Structural Biology (7.376)、Angewandte Chemie-International Edition in English (6.983)、Journal of Clinical Oncology (6.922)、Annals of Neurology (6.699)、Molecular Pharmacology (6.580)、Journal of Cerebral Blood Flow and Metabolism (6.555)、Journal of the American Society of Nephrology (6.551)、American Review of Respiratory Disease (6.421)、American Journal of Pathology (6.334)、Journal of Virology (6.033)、European Journal of Immunology (6.015)、Immunological Reviews (5.946)、Journal of Neuropathology and Experimental Neurology (5.831)、Journal of the American College of Cardiology (5.793)、Seminars in Cancer Biology (5.607)、Bioessays (5.576)、Arteriosclerosis Thrombosis and Vascular Biology (5.533)、Hepatology (5.392)、Progress in Biophysics & Molecular Biology (5.379)、Journal of Molecular Biology (5.346)、International Review of Cytology-A Survey of Cell Biology (5.292)、Human Molecular Genetics (5.273)、Journal of the American Chemical Society (5.263)、Quarterly Reviews of Biophysics (5.211)、Proteins-Structure Function and Genetics (5.162)、Biochemistry (5.144)、Molecular Microbiology (5.024)。
较低影响因子期刊（IF < 5）：Pharmacogenetics (4.988)、Hypertension (4.981)、Advances in Second Messenger and Phosphoprotein Research (4.972)、European Journal of Neuroscience (4.921)、Journal of Neurochemistry (4.852)、Journal of Cell Science (4.827)、Glia (4.809)、Protein Science (4.806)、Genes Chromosomes & Cancer (4.764)、Developmental Biology (4.752)、Laboratory Investigation (4.751)、British Journal of Pharmacology (4.739)、Endocrinology (4.736)、Neurology (4.633)、Journal of Pathology (4.617)、Analytical Chemistry (4.509)、Genetics (4.509)、Pharmacology & Therapeutics (4.469)、Thrombosis and Haemostasis (4.464)、Annals of Surgery (4.440)、Current Biology (4.406)、Journal of Lipid Research (4.340)、Trends in Cardiovascular Medicine (4.338)、International Immunology (4.333)、Journal of Physiology-London (4.327)、Neuroscience (4.288)、Nucleic Acids Research (4.235)、Cell Growth & Differentiation (4.179)、Archives of Internal Medicine (4.166)、Biochemical Journal (4.159)、Free Radical Biology and Medicine (4.089)、Genomics (4.089)、Acta Crystallographica Section D-Biological Crystallography (4.029)、American Journal of Respiratory Cell and Molecular Biology (4.014)、Journal of Clinical Endocrinology and Metabolism (4.002)、Kidney International (3.995)、Journal of Nuclear Medicine (3.960)、Drugs (3.903)、Journal of Bacteriology (3.903)、Virology (3.901)、Radiology (3.899)、FEBS Letters (3.842)、DNA and Cell Biology (3.788)、Infection and Immunity (3.721)、Journal of Investigative Dermatology (3.681)、Journal of Leukocyte Biology (3.639)、Journal of Neuroimmunology (3.639)、Cancer Gene Therapy (3.607)、Trends in Biotechnology (3.606)、Journal of Comparative Neurology (3.584)、Journal of Pharmacology and Experimental Therapeutics (3.582)、Journal of Molecular Evolution (3.519)、Receptors & Channels (3.516)、Journal of Allergy (3.508)、Cytogenetics and Cell Genetics (3.502)、Cardiovascular Research (3.494)、Experimental Hematology (3.458)、European Journal of Biochemistry (3.451)、British Journal of Cancer (3.449)、Human Mutation (3.439)、Journal of Histochemistry & Cytochemistry (3.427)、Cell Calcium (3.419)、Journal of General Virology (3.410)、International Journal of Cancer (3.403)、Journal of Neuroscience Research (3.377)、Hippocampus (3.341)、Antimicrobial Agents and Chemotherapy (3.251)、American Journal of Physiology (3.244)、European Journal of Human Genetics (3.205)、Biochemical and Biophysical Research Communications (3.179)、Clinical Chemistry (3.169)、Carcinogenesis (3.153)、Biology of Reproduction (3.123)、Cancer Treatment Reviews (3.106)、Plant Molecular Biology (3.089)、Journal of Cellular Biochemistry (3.075)、Journal of Cellular Physiology (3.049)、Molecular & General Genetics (2.976)、Molecular Biology Reports (2.932)、Atherosclerosis (2.880)、Breast Cancer Research and Treatment (2.879)、Cancer (2.864)、Journal of Membrane Biology (2.844)、Cytokine (2.836)、Immunology (2.832)、Transplantation (2.829)、Chromosoma (2.825)、European Journal of Cell Biology (2.802)、Growth Factors (2.802)、PCR-Methods and Applications (2.783)、Journal of Molecular and Cellular Cardiology (2.780)、Archives of Biochemistry (2.767)、Electrophoresis (2.730)、Journal of Molecular Endocrinology (2.727)、Mammalian Genome (2.714)、Toxicology and Applied Pharmacology (2.703)、Journal of Medical Genetics (2.701)、Brain Research (2.687)、Neuroendocrinology (2.684)、Clinical and Experimental Immunology (2.680)、Pflugers Archiv fur die Gesamte Physiologie des Menschen und der Tiere (2.646)、European Journal of Pharmacology (2.637)、British Journal of Haematology (2.616)、European Cytokine Network (2.604)、Dementia (2.594)、Developmental Genetics (2.577)、Neuroreport (2.570)、Cytometry (2.552)、Human Genetics (2.551)、Acta Neuropathologica (2.546)、Journal of Immunotherapy (2.520)、Biochimica et Biophysica Acta (2.500)、Journal of Applied Crystallography (2.497)、Free Radical Research (2.468)、Transgenic Research (2.466)、Theoretical and Applied Genetics (2.452)、Biochemical Pharmacology (2.447)、Biological Reviews of the Cambridge Philosophical Society (2.429)、Leukemia (2.350)、Histochemie (2.348)、Journal of Vascular Surgery (2.348)、Life Sciences (2.345)、Clinical & Experimental Metastasis (2.330)、Molecular Immunology (2.330)、Differentiation (2.329)、Journal of Hypertension (2.318)、Neuroscience Letters (2.318)、Biopolymers (2.307)、Biotechniques (2.305)、Journal of Chromatography A (2.296)、Journal of Autonomic Pharmacology (2.286)、European Respiratory Journal (2.275)、Immunobiology (2.270)、Scientific American (2.265)、Tetrahedron Letters (2.257)、Annals of Oncology (2.256)、Journal of Laboratory and Clinical Medicine (2.255)、Developmental Brain Research (2.246)、Journal of Rheumatology (2.239)、American Journal of Cardiology (2.238)、Neurochemistry International (2.236)、Cell and Tissue Research (2.204)、European Journal of Clinical Investigation (2.174)、Current Genetics (2.171)、Bone and Mineral (2.162)、Virus Research (2.161)、Gene (2.160)、Physical Review E (2.159)、Tetrahedron (2.147)、Medical Microbiology and Immunology (2.145)、Visual Neuroscience (2.137)、European Journal of Cancer (2.095)、Seminars in Hematology (2.095)、Journal of Chemical Neuroanatomy (2.092)、Peptides (2.092)、Clinical Immunology and Immunopathology (2.088)、Clinical Science and Molecular Medicine (2.070)、Genome (2.069)、Surgery (2.063)、News in Physiological Sciences (2.052)、American Journal of Kidney Diseases (2.048)、Journal of Autoimmunity (2.044)、Bone Marrow Transplantation (2.041)、Biosensors & Bioelectronics (2.033)、British Heart Journal (2.031)、British Journal of Anaesthesia (2.025)、Journal of Structural Biology (2.020)、Yeast (2.000)、Analytical Biochemistry (1.996)、Experimental Brain Research (1.967)、Medical Physics (1.902)、Journal of Immunological Methods (1.901)、Epilepsy Research (1.897)、Neuropathology and Applied Neurobiology (1.889)、Analytica Chimica Acta (1.887)、American Journal of Hypertension (1.880)、Biological Chemistry Hoppe-Seyler (1.860)、Cancer Surveys (1.857)、European Biophysics Journal (1.857)、Oncology (1.857)、Research in Microbiology (1.857)、British Journal of Surgery (1.842)、American Journal of Medical Genetics (1.836)、Neuromuscular Disorders (1.818)、Gann (1.805)、Stem Cells (1.803)、Anatomy and Embryology (1.801)、Archiv fur Mikrobiologie (1.801)、Journal of the Chemical Society-Faraday Transactions (1.771)、Antiviral Chemistry & Chemotherapy (1.767)、Journal of Steroid Biochemistry and Molecular Biology (1.739)、Biochimie (1.735)、Journal of Electroanalytical Chemistry (1.735)、Journal of Cardiovascular Pharmacology (1.709)、Cancer Immunology Immunotherapy (1.702)、Psychoneuroendocrinology (1.699)、Biophysical Chemistry (1.696)、European Heart Journal (1.682)、Magnetic Resonance Imaging (1.672)、Cold Spring Harbor Symposia on Quantitative Biology (1.669)、Computer Applications in the Biosciences (1.668)、International Journal of Developmental Neuroscience (1.648)、Inflammation (1.643)、Analyst (1.641)、Journal of the Chemical Society-Perkin Transactions 1 (1.641)、Molecular and Cellular Biochemistry (1.625)、Seminars in Oncology (1.608)、Neuropeptides (1.601)、Molecular Neurobiology (1.600)、Cancer Chemotherapy and Pharmacology (1.598)、Computer Physics Communications (1.598)、Methods in Enzymology (1.586)、Neurochemical Research (1.577)、American Journal of Hematology (1.568)、Annals of Thoracic Surgery (1.568)、Seminars in Nephrology (1.533)、Applied Spectroscopy (1.531)、Journal of Biomolecular Structure & Dynamics (1.528)、Carbohydrate Research (1.506)、Protein Expression and Purification (1.497)、Acta Physiologica Scandinavica (1.496)、Pure and Applied Chemistry (1.495)、Journal of Controlled Release (1.483)、Journal of Virological Methods (1.464)、Journal of Cancer Research and Clinical Oncology (1.459)、Diseases of the Colon & Rectum (1.450)、Clinical Nephrology (1.441)、Natural Immunity (1.431)、Nephrology Dialysis Transplantation (1.424)、International Journal of Protein Research (1.410)、Journal of Inorganic Biochemistry (1.399)、Steroids (1.396)、Theriogenology (1.395)、Journal of Lipid Mediators and Cell Signalling (1.393)、Journal of Crystal Growth (1.390)、Applied Microbiology and Biotechnology (1.363)、Oncology Research (1.361)、International Journal of Developmental Biology (1.356)、Prenatal Diagnosis (1.355)、Endoscopy (1.354)、Sensors and Actuators B-Chemical (1.333)、Fibrinolysis (1.329)、Bioelectrochemistry and Bioenergetics (1.324)、Research in Immunology (1.321)、Macromolecular Theory and Simulations (1.312)、Human Heredity (1.302)、Bulletin of Mathematical Biology (1.300)、Nucleosides & Nucleotides (1.293)、Biotechnology and Applied Biochemistry (1.291)、American Heart Journal (1.290)、Lasers in Surgery and Medicine (1.288)、Regulatory Peptides (1.288)、Cancer Investigation (1.282)、Biochemical Society Transactions (1.275)、Electroanalysis (1.266)、World Journal of Surgery (1.262)、In Vitro Cellular & Developmental Biology-Animal (1.261)、Autoimmunity (1.257)、Journal of Chromatography B-Biomedical Applications (1.255)、Domestic Animal Endocrinology (1.254)、Archiv fur Toxikologie (1.249)、Immunology and Cell Biology (1.242)、Research in Virology (1.231)、Journal of Photochemistry and Photobiology A-Chemistry (1.226)、Cancer Letters (1.219)、International Journal of Biological Macromolecules (1.205)、Journal of Biotechnology (1.203)、Annals of Hematology (1.182)、Mechanisms of Ageing and Development (1.182)、Leukemia Research (1.179)、Plant Science (1.179)、Journal of Dairy Science (1.161)、Immunopharmacology (1.157)。