Abstract: In order to research the coal moving laws in large mining height and top coal caving,force characteristic,the orders and recovery ratio of different horizon were studied by analyzing the process of top coal caving with PFC^2D software and top-coal tracker in 8206 working face.The results show that,in the process of mining 8206 working face,four different stress regions are got with their own moving characteristics.According to the data about deep basis points of different horizon measured from the working face,it has greater difference between different locations about recovery ratio,taking on the lower and the ends are lowest in working face.The top coal falling order is almost the lower first,then the middle and the upper.To improve the coal extraction ratio,we can mine as much as possible at the beginning and end,make the caving ability of roof coal better,chose reasonable drawing interval and way,strengthen the management of the production,etc.