Abstract: The Niuganchong avalanche is at Shangyangshui river mining area in Jinzhong, Kaiyang, Guizhou. The mining area is affected by Yangshui anticline and NNE trending fracture. Cliffs in the mining area are of zonal distribution. Combining with the intensive mining activities, the roof dolomite cliff covering the lower phosphate rock layer is liable to develop unstable rock zone. Thus there have been many avalanches in the last 20 years. The Niuganchong avalanche studied in this paper occurred in 2005.Its colluvial deposits are accumulated in the form of belts in the valley and formed three significant regions. Their movements and accumulation characteristics are obviously different. Field investigation and analysis are carried out on the accumulations characteristics. Rock movement path is also simulated. Then, this paper propose that the colluvial deposits are usually rolling to the valley and forming rubbles. But a few chunks of falling rocks are influenced by micro-relief and begin with rolling and end with leaping along a small gully nearby the right side of the rubbles. Each drop point is easy to find out. Finally complex movement characteristics and numerical simulation of the avalanche are studied to forecast the damaging range of dangerous rocks in future.