Objective:To evaluate the effects of sperm with different parameters on the outcomes of intracytoplasmic sperm injection(ICSI). Methods:Totally 290 ICSI cycles were analyzed retrospectively. They were divided into 5 groups according to sperm parame-ters:group A(normal sperm forms or mild oligoastheno-teratozoospermia),group B(severe oligozoospermia),group C(severe astheno-zoospermia),group D(severe teratozoospermia),group E(severe oligoastheno-teratozoospermia). Fertilization rate,cleavage rate,transferable embryos rate,good quality embryos rate,implantation and pregnancy rates were compared between the groups. Results:Fertilization rate,cleavage rate,transferable embryos rate and good quality embryos rate were not significantly different among the 5 groups( χ2=1.27,P=0.87; χ2=1.34,P=0.86; χ2=0.56,P=0.97; χ2=1.39,P=0.85). The chemical pregnancy rate,embryo implantation rate and clinical pregnancy rate were lower in group D and E than in group A( χ2=12.1,P=0.00; χ2=10.15,P=0.00; χ2=10.78,P=0.00; χ2=9.90,P=0.00; χ2=8.13,P=0.00; χ2=11.78,P=0.00),B( χ2=6.04,P=0.01; χ2=7.79,P=0.01; χ2=7.21,P=0.01; χ2=4.29,P=0.04; χ2=5.63,P=0.02; χ2=7.21,P=0.01)and C( χ2=7.01,P=0.01; χ2=6.47,P=0.01; χ2=6.95,P=0.01; χ2=5.14,P=0.02; χ2=4.35,P=0.04; χ2=7.01,P=0.01). Conclusions:Sperms of different parameters used in ICSI treatment can not affect the fertilization rate. Severe teratozoospermia can reduce the implantation and pregnancy rates after ICSI treatment.