Ramms:: avalanche model is used to simulate avalanche in complex terrain. The model has been widely used in avalanche hazard studies in Switzerland. The ramms:: avalanche model combines state-of-the-art digital solutions with helpful input features and friendly visualization tools. Many of the input and output features are optimized, enabling users to easily modify dangerous scenarios and control simulation results. The core of the program is an effective second-order numerical solution, that is, the depth averaged avalanche dynamic equation. In the 3D digital terrain model, the velocity and velocity of avalanche are calculated. Using the GIS type drawing feature, you can easily specify a single or multiple publishing areas. Users can get useful overview information about the simulation, including important information about the release area (average slope, total capacity), traffic behavior (maximum flow and height), and stop behavior (mass flow). Maps and remote sensing images can be superimposed on terrain models to help determine input conditions and calibrate models based on known events. The ramms:: avalanche model has been used in more than 70 places around the world, and the software has been successfully applied to high mountain areas such as the Alps, Himalayas, Andes, Rockies, tatare and other areas.