Composite perforating technology has been widely used in oil fields for more than ten years, and has seen obvious results in the development of medium and low permeability layers. However, with the continuous deepening of oilfield development, the formation conditions needed to be developed are getting worse and worse, and the well conditions are becoming more and more complex. Some wells have no obvious effect in composite perforation construction. Previous research results show that the peak pressure and effective action time of gunpowder are the key factors affecting the construction effect of composite perforation. In this paper, the factors affecting the peak pressure and effective action time of composite perforation are analyzed and studied by using gas dynamics, detonation theory, seepage mechanics, statistics, numerical calculation methods and electrical logging related theories, combined with simulation and field tests.