Pepper crop (Capsicum annuum,l) is considered one of the most important vegetable crops, under greenhouse conditions. This work aim to study influence of certain environmental factors (Temperature and relative humidity) on population of pepper pests i.e. aphid (Aphis gosspii), white fly (Bemisia tabaci) and spider mites (Tetranychus urticae), through growing seasons 2012 and 2 013, at two different regions (El-Dokki region, Giza governorate and El-Nobria region, Beheria governorate), Egypt. Population of white fly was the most severity compared with other pests, but population of aphid was moderately severity and population of  spider mites was less severity. While, population of tested pests were more severity in El-Nobria region (Beheria governorate) than El_Dokki region (Giza governorate). However, population of tested pepper pests were increased with increasing the temperature through studied seasons. Also, population of tested pests were the most severity  during the period from May to June compared with the period from January to March for to growing seasons and two regions.  Population of all pepper pests were the most severity during may in El_Nobria region (Beheria governorate) during may-june in El-Dokki region (Giza governorate) Meanwhile, relative humidity was less effectively on population of tested pepper pest through this study.