\[Abstract\]ObjectiveTo use ultrasound elasticity imaging (UEI) technology for evaluating the elasticity changes of the deep vein thrombosis (DVT) at different stages. MethodsConventional ultrasonic diagnoses were performed in 49 patients with DVT and the patients were divided into acute stage, sub-acute stage, and chronic stage. The elastic image characteristics of the thrombosis were observed at different stages and the strain ratio (B/A) between the muscle tissue around the vein and the thrombosis was calculated. Results(1) In ultrasound elasticity image, the acute thrombosis was mainly red, the sub-acute thrombosis was green, and the chronic thrombosis was blue. (2)The strain ratio of the sub-acute thrombosis group and the chronic thrombosis group were significantly higher than that of the acute thrombosis group（P<0.001, P<0.05）, and the strain ratio of the chronic thrombosis group was significantly higher than that of the sub-acute thrombosis group（P<0.05）. ConclusionUEI technology can be used to evaluate the elastic changes in different stages of the deep vein thrombosis, and it can help to select treatments for thrombosis and predicting the complications.