The reproductive ecology of Phrynocephalus przewalskii was studied in Shapotou of Ningxia. Male and female P. przewalskii were examined monthly in 1987 and 1993. Seasonal changes in the histological morphology of the testes and developments in ovum cells were observed. The reproduction of P.przewalskii occurs from spring to summer every year, showing significant seasonal circle.When adult males concluded hibernation their testes have fairly developed. The weight and the volume of the tests were upto greates...