Objective To explore the relationship between the type of TORCH infection and pregnancy outcome through the de-tection of TORCH infection in pregnant women with IgG avidity index (AI) .Methods Collected each type of TORCH pathogens IgM positive maternal serum ,and detect the IgG avidity index and track the outcome of pregnancy .Results The rate of TORCH pathogens recent infection (AI<30% )in pregnant women ,HSV ,RUB ,CMV ,TOXO respectively were 0 ,3 .8% ,9 .3% ,7 .9% ;In the group of pregnant women with TORCH-IgG AI<30% ,there were 2 cases of pregnancy outcome of abnormal (missed abortion) and one case of fetal malformations (hydrocephalus) .Conclusion In the recent infection of TORCH pathogens in pregnant women , mainly are non-primary infection ;The damage of cytomegalovirus and Toxoplasma gondii primary infection to the fetus is much larger than the non-primary infection .