Abstract: Through the research of coal reservoir in Jiaoping mining area, we found that the coal reservoir has characteristics of low-rank coal, large thickness, low gas content, and the minimum principal stress field is north west-south east direction; we optimized the construction technology of hydraulic fracturing in coal seam by using FracproPT 2007 three-dimensional fracturing software including the construction displacement, prepad fluid volume, sand ratio; through the analysis of the data, we obtain the influence of various factors on the fracturing effect and verify by practical examples, which proves that the optimization results that large displacement, high sand content, medium sand ratio of construction process plays a significant effect of increasing yield.