The Dos-based DDA program originally developed by Dr. Shi has been upgraded into the Windows-based version by China Institute of Water Resources and Hydropower Research (IWHR) recently. In this new version of DDA program
user-friendly pre-processing and post-processing are developed
and the process of slope excavation can be simulated. An application of the new program to analyze the stability against sliding of Xiangjiaba gravity dam is presented.