Abstract: Perforation is one important link to guarantee the perforating degree of medium and deep oil and gas layers.The designed penetration depth and perforation diameter of existing perforators are based on the surface cement target experiment, which is more different from the actual downhole conditions.In addition, the commonly used perforating skin model does not take the perforation friction into consideration, so the relationships between penetration depth and production capacity cannot be described accurately.In this paper, from the viewpoint point of fluid dynamics, an optimization model for optimal penetration depth was established based on the mathematical model coupling oil reservoir and perforation flow.In addition, a set of new methods for the perforation charge optimization and type selection were developed.And its application indicates that this method can provide the theoretical basis for the design of optimal perforation depth, and plays an important role in guiding the optimization of perforation parameters of medium and deep reservoirs in the area of Bozhong.