We also found interactions between 4-t-OP and rs4986894 in CYP2C19, and between rs1048943 in CYP1A1, on male infertile risk (Pinter = 8.09×10−7, Pinter = 3.73×10−4, respectively).We observed notable interactions between 4-t-OP exposure and metabolism enzyme gene polymorphisms on idiopathic infertility in Han-Chinese men. The gene discussed is CYP2C19; the disease is Infertility.