Abstract: The DDARF (discontinuous deformation analysis for rock failure) method is improved by using the displacement convergence criterion and a program is developed for the method. Combining the discontinuous deformation analysis (DDA) and the fracture network seepage (FNS) model,a hydro-mechanical coupling model is established. The effects of the deformation of the fractured rock mass on the fracture seepage and the failure characteristics of the rock mass under the hydro-mechanical coupling are studied. It is found that the main fracture plays a role of controlling the distribution of the seepage field. The water head with consideration of the coupling effect is larger than that without considering the coupling effect. Meanwhile, it is shown that the coupling helps the slope deformation and will lead to failure more easily. The program convergence criteria in the DDARF are compared with those of the laboratory tests and the engineering example. The form of the crack propagation does not change before and after the improvement. The results show that the program convergence criteria of the DDARF are effective.