Abstract: Yongsheng located in the northeast of Dali fault system and the north end of Chenghai-Binchuan fault zone. Faults in Yongsheng area have been strongly active since the Pliocene and with significantly tectonic geomorphology characteristics. According from 1:50000 active fault mapping, there are 14 faults in Yongcheng-Jinguan area. Jinguan Fault (F1), Yongsheng Fault (F2) and Muerping-Yangping Fault (F3) are the largest scale and with strongest activity among them. They belong to the first class branch faults of Chenghai-Binchuan fault zone, the others belong to the second class branch faults. Tectonic landform characteristic, geological bodies broken by fault and the results of striations statistics all indicate that faults in Yongsheng area normal fault activities was the predominance. According to the activity, faults in this area are divided in to five classes, including stronger, strong, medium, weak and weaker. Jinguan fault is the most active fault among them, the vertical movement rate up to 0.2~0.26 mm/a. The geometry, kinematics and dynamics features of the main faults in Yongsheng area have been discussed. The result shows that the faults in Yongsheng area make up an east protruding curved rotational shear tectonic system in the plane, and form a negative flower structure in profile which was very common among transtension fault system. The current activity of Chenghai-Binchuan fault zone is near EW extension is mainly caused by the near SN compressive stress. And it has a certain left lateral strike slip because of the superposition of the twisting action. The curved rotational shear tectonic system in Yongsheng area and the Northwest Yunnan rift zone are all form from arc belt clockwise in Sichuan-Yunnan and the strike slip puil apart process of Nandinghe fracture、Wanding fracture and Litang fracture.