To evaluate sperm parameters as morphology of sperms in conjunction with number of motile sperms, according to 2010 World Health Organization (WHO) criteria’s and to obtain optimal sperm parameters. We have examined prospectively 50 Intrauterine Insemination (IUI) cases for sperm parameters (morphology, TPMSC) and effects of some variables (woman age, infertility duration, FSH level, primary and secondary infertility) to pregnancy rate. First we divided cases in to 2 groups according to TPMSC (Total Progressive Motile Sperm Count) less than 1 million-greater than 1million- and compared number of progressively motile sperms and fertility rate. There was no statistically significant difference between pregnancy rate and sperm morphology (p>0.05) The pregnancy rate for the patient population with TPMSC >1million was more than another and this was statistically significant (p<0.05). There was no significant fertility difference among subgroups for Morphology and TPMSC as these 2 parameters are evaluated together (p>0.05). There was no significant difference according to age related pregnancy rate (p>0.05). There was no significant statistical differences among groups and subgroups in infertility duration, FSH level and woman age (p>0.05). Our study shows that pregnancy rate has no correlation with sperm morphology -as sperm parameter- for patients that IUI was applied. For the group with TPMSC >1 million, fertility rate was higher and this was statistically significant. Sperm parameters especially TPMSS that are important in determining the treatment plans of infertile patients but the effectiveness of morphology should be discussed.