Dabei 1 Area is subsalt gas structure in Crassus thrust belt of Kuqa Depression. At present, ten wells have been drilled in this area. From the testing results of existing oil, gases are in each broken trap, but it seems that they are not full filled. Especially, when Well Dabei 104 is lost, the relationship of gas and water distribution becomes an urgent and important issue to be found out in Dabei 1 Area. Proceed from the lateral sealing evaluation of fauh and based on the available data in this area, this paper selected the SGR method, and used the lithology joint method and the contrast of fluid parameters on both sides of fault as additional evidence. The results show that the F1 fauh of Dabei 1 Area is open. The lateral sealing ability of F2 and F3 faults controls the gas-water interface of Dabei 101-103 broken trap. Based on this gas-water interface, the d value of Dabei 1 Area is demmvated in order to predict the gas-water interface of the other broken traps.