Abstract: For predicting the risk of coal and gas outburst in the first mining 1(4+5)01 face in Yaojiashan Mine, we establish a mechanical model, analyze the relationship between horizontal stress σ_x and abutment pressure σ_v. By simulating the variation of unit coal in mining face, the biggest abutment pressure happens in the middle of mining face, it is 73.46 MPa, the smallest abutment pressure happens in the position of crossheading, it is 56.21 MPa. The unit coal near the crossheading is easier to be initially damaged. By the formula simulating, if the coal unit does not has initial damage of outburst, the horizontal stress of mining face can not exceed 41.97 MPa.