Abstract: Abstract: To find out the distribution of small structure inside the coal mining face is an important part of the hidden disaster factors, the ISS transmission method is a suitable and relatively mature technique, but it has its limitations. In order to find out the distribution of the fault and collapse pillar in 5316 working face of Zhaozhuang coal mine of Jincheng coal industry group, and study application of ISS transmission method and reflection method in detection of small structures, in this paper, detectors and explosive source are arranged in two parallel grooves and open-off cut, the joint of ISS transmission method and reflection method is carried out. It has been proved to have good geological effect. This paper shows that as long as the design of the observation system is reasonable, ISS transmission method and reflection method can complement each other and the interpretation accuracy greatly improved, also can provide safety guarantee for coal mine production.