BackGround: The aim of this study was to; Assess factors influencing use  of contraception among women in Port Said City. Subjects and Methods: Across sectional descriptive survey design was utilized in this study.  A total of purposive sample  of 600 contraceptive user's women from family planning clinics in 12 health centers representing the six districts of Port-said city were recruited. A structured interviewing questionnaire was used for data collection .Results: with regard  to the age of women it was  ranged between 18 and 45years, the maximum number of women was in the age group of 25- less than 35 years (47.5%) with a mean age of 30.4 ±6.7 years. The most common methods used were hormonal method (56.5%).  The IUD was used by 28.3%. The majority of the women choose the method according to their desire and with their husband agreement. More than one third of them received contraceptive information from friends and relatives. Only 34.7% of the sample suffered from side-effects and complications associated with the use of the contraceptive method. Method failure, cognitive barriers as well as the desire for conception were the most common reasons for discontinuation of contraceptives. Conclusion:  More than half of the sample used hormonal contraceptives, over than one fourth used IUCD and few women used barriers. Significant relation was found between socioeconomic factors, biological, menstrual factors and utilization of contraceptive methods .Recommendations: The nurse midwife should inform the women  about the side effects of the method used what to do if they experience side effects, and told about other available family planning methods as well as clear up their misconceptions.