Based on the principle of forest engineering systems of the torrent control,the importance,current stute,background,principle and method of planning in the risk area of the Alal were described.

In recent years,with the development of information technology and the application of landscape ecology and ecology economics in torrent control ,in the field of torrent control,some progress was made in theory and research method.

This article introduced concrete method of torrent classification mapping of torrent risk zone which has been carried out in all Beijing mountainous regions,and this method is an effective work for basic risk study on site of torrent disaster forecasting in China.

Based on geography information system,the torrent classification model and hazard zone mapping model and relative information system were developed, using Microsoft Visual Basic 4.

Base on geography information system, the torrent classification model and hazard zone mapping model and relevant information system were developed, using Microsoft Visual Basic 4.

Grey prediction models on the activity period of the torrent disaster and debris flow activity intensity are developed based on the in situ survey data of the torrent disaster activities in the northern mountainous area of Beijing.