Based on low position top coal could not mine out completely, low mining rate, with large tramp easily, high rate of coal and gangue in extremely thick coal seam fully mechanized caving, Shanxi Jinhui Ruilong Mine was taken as an example,  from the caving mining and coal process design loses, improving the extraction rate of technology and management methods were put forward, comparing with the coal caving effect, the result showed that the technology could improve the production rate and provide experience and reference under the similar conditions.