Abstract： Objective To investigate the anticoagulant factors that Kazakh women are prone to develop deep vein thrombosis before or after delivery.Methods The protein C,protein S,antithrombin Ⅲ (AT-Ⅲ) activity,activated protein C resistance ratio (APCR) of 36 Kazakh women cases and 39 Hans women cases before and after delivery were determined.Results The protein S (43.13±11.36,58.05±17.10) was significant changed (P＜0.01)in Kazakh women before and after delivery.The protein C (97.34±18.37,118.02±23.46) and protein S (58.05±17.10,67.97±19.22) were statistically different between Kazakh women and Han women after delivery(P＜0.05,which protein C was P＜0.01).The anticoagulant indexes of Kazak women after delivery was still within normal range.Conclusions Normal women have prothrombotic state before and after delivery,especially the Kazakh women.It may be an important factor of deep vein thrombosis-prone before and after delivery that protein C and protein S in Kazakh women have lower activity than that in Han women.The detection of anti-coagulation have some clinical significance on the prevention of the deep vein thrombosis in Kazakh women before and after delivery.