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In this study, effects of some factors on the reproductive characteristics of Simmental cattle imported from Federal Germany were investigated. Since the cattle were reared on various farms, a common feeding and managemental programme was not employed. The measurable factors of the environment such as, farm type, year and season and pregnancy or lactation turn were investigated. The data was analysed statistically by using the least squares means method to measure the effect size of environmental factors and contrast-test and GLM procedure in SAS program pack were used to compare the values. The first calving age of Simmental cattle was 27.17 months, service number was 1.92, days open was 100.75 days, calving interval was 390.18 days. The year factor was significant (P<0.001) on the first calving age and season was significant on service number (P<0.01) and open period (P<0.001). All the factors were not significant on calving interval.