Abstract: Type Curve is a very useful tool in the interpretation of Well test data. Once the optimum match is obtained, the match point and the match curve data, may be used to Calculate formation transmissibility (Kh/μ_o) and formation effective permeability (K), along With Wellbore storage Constant (C) and skin factor (S), but it Can not be used to determine reservoir pressure in the past. In this paper, a method of determining reservoir pressure by match data of the type Curve is presented. Therefore, the application range of the type Curve Will be extended.