The progress in research on electrostatic hazards of composite solid propellant was summarized in three aspects,which are experimental testing method, theoretical prediction and electrostatic effect mechanism. Researchers used special equipments to measure the electrostatic energy acted on the sample indeed. This energy was the criterion of electrostatic sensitivity. The percolation coefficient was used as a simple prediction of electrostatic hazard, and the model based on hot spots forming & growth was used to predict the electrostatic hazard with the characters of propellant itself, such as mechanical, burning characters. Based on temperature measured by infrared method and observation heat radiation and transfer caused by electrostatic energy, the popularly accepted “hot spot” mechanism were outlined.