To understand the embryonic stage of diapause incidence, the embryonic development was observed, the changing regularity of egg water contents after deposited and the stagnation stages of embryonic development were examined in Tieling, Jinan, Changsha and Danzhou population of Oxya chinensis（Thunberg）. According to the embryonic morphology, from the phase which protocephalon of embryo fold with the other parts, the process of embrynic development was divided into 11 stages. The eggs of 4 geographical populations had a process of rapid water absorption at 25℃. However, the water contents of eggs showed no significant increasing and embryonic development was slow in the Tieling and Jinan population after day 12 of egg deposited. The time of egg diapause incidence was in the 7th stage of embryonic development in the Tieling, Changsha and Danzhou populations, but was in stage 6 to stage 7 in the Jinan population. The Changsha population of O. chinensis shows a uni-bivoltine mixed life cycles, and adults of the second generation oviposited from early October to late November. In the field, the eggs laid in October developed to the 7th stage of embryonic development at 15 December and overwintered with diapause status, but the eggs laid in November did not finish the pre-diapause development, and overwintered as eggs with the 2th to 5th stage of embryonic development. The emberyos developed slowly, but did not stop in the Changsha population of O. chinensis in the winter.