Abstract: Study of finite multi-well system is made by taking two wells an example. A new method for pressure superposition of Laplace transformation is applied to deduce the Laplace's solution of well testing model for finite multi-well system. The convenient and practical method can be easily extended to the conditions of many adjacent wells. This paper draws the type curves and analyzes influences of various factors such as distance and production from adjacent wells on the two testing wells. The results show that most wells would be influenced by adjacent wells in the subordinate phase of production characterized by the dropping of differential of pressure curve similar to that of boundary reflection. Using this well testing model for interpretation could exclude these interferences to a large extent and improve the utilization and effect of well testing data.