Objective To investigate the association between the single nucleotide polymorphisms of FADS1 and FADS2(SNP) of polyunsaturated fatty acids metabolic rate-limiting enzymes and coronary heart disease(CHD) and to clarify the action mechanism of FADS1/FADS2 in the occurrence of CHD.Methods 237 patients diagnosed with CHD and 224 healthy controls from the Han population in Northern China were selected.Questionnaires were used to collect the basic information about individual objects.PCR-RFLP analysis was applie...