Abstract: In order to make the value of stress increment in the method of multi factor stress superposition impact risk assessment more in line with the actual situation of the site, the stress measuring points of coal body are arranged in the different influence areas of different factors along the working face, the change of stress of coal body under different influence factors of impact pressure of the test working face is measured, and then the maximum stress increment of coal body under single influence factor is analyzed, which can be used for similar work The value of stress increment in the face impact risk pre evaluation can provide a reference to improve the accuracy of the impact risk pre evaluation. According to the actual measurement and analysis of the test working face, the maximum stress increment under the influence of "square" of the working face is about 2.50mpa, the maximum stress increment under the influence of the side bearing pressure of the goaf is 1.75mpa, the maximum stress increment under the influence of the fault structure is about 1.5MPa, and the maximum stress increment under the influence of mining is about 3.65mpa.