Abstract: According to there are more collapse posts to affect coal mining face high efficient mining in Sanjusheng coal mine, the method of field measurement was applied to study the collapse posts affected to the mine strata pressure in 4304 coal mining face during the initial mining. The results showed that: due to the affected of collapse posts, the initial roof weighting was different of the past performance, the strength was reduced, time was early, and step distance was reduced. Analysis of the experimental results have reference for push the collapse posts during the initial mining under similar conditions.