In order to study the structural characteristics of Tuha Basin, characteristics and causes of gravity field of the study area were discussed and analyzed, and the faulted structure system was inferred through collecting and processing the existing gravity survey data of the area. The gravity high belt near west-east trending reflects the development features of Late Paleozoic in the southern part of study area. The gravity low belt is caused by basal depression in middle part and the northern part. Regional gravity high and gravity low reflect the regional uplift and depression structures. Developed faults are mainly north-east trending and west-east trending, which control the basin boundary and the distribution of developed formation within basin.