Abstract: Objective: To investigate the effect of sperm relative parameters on the outcome of in vitro fertilization （ＩＶＦ），in order to direct the selection of fertilization method. Methods：Total 2 591 IVF cycles in the controlled ovulation from January 2012 to June 2013 were selected. After matching female factors（age，weight，cause of infertility，base FSH and LH，endometrial thickness on hCG day and the number of acquiring ovum）between pregnant women and non-pregnant women, 457 pairs were analyzed. The sperm relative factors were analyzed in those women with different pregnant outcomes. Results：The rate of normal sperm morphology in pregnant cycles was significantly higher than that in non-pregnancy cycles（P＜0.05），but there was no significant difference in sperm density，activity, survival rate and qudlified rate between two groups（P＞0.05）. Conclusions：There were different rates of normal perm morphology in IVF cycles with different outcomes，suggesting that the rate of normal perm morphology could have good forecasting value for IVF outcomes.

Key words: Infertility, male, Spermatozoa, Semen, Fertilization in vitro, Pregnancy rate