As the largest coal-bearing area in Ningxi,the east Ningxia(Ningdong) area has nine Permian-Carboniferous and Jurassic coal fields.According to the characteristics of these two types of coal fields in the Ningdong area,the authors established the 2.5D gravity field model from the forward modeling.The coal-bearing area could be identified and separated by the potential field separation method based on the 1:200 000 gravity data.It is found that the first to third wavelet details correspond well with the known coal fields after applying the wavelet analysis to the Bouguer gravity anomaly,while the local gravity anomalies derived from the slide averaging method have no obvious correspondence with the known coal fields.Therefore,the wavelet analysis of the gravity data has good performance in predicting the Permian-Carboniferous and Jurassic coal-bearing area.And at the same time,the use of the 1:200 000 gravity data is maximized for the coal field exploration.