Abstract: Pumping test is one of the primary means of determining the hydrogeological parameters, and identifying the hydrogeological conditions. For the results that calculated in common pumping test is usually smaller than its truthful data, in weakly cemented sandstone aquifer in western China, this paper aiming at seeking the K parameter by the reverse-seeking method. According to the drawdown superposition principle and drawdown distribution principle, this paper makes use of drawdown-distribution-coefficient to calculate the K factor, in a group pumping wells test and without specially observation hole. Then compare the results with the parameter which is evaluated by the conventional method, and verify the result by the FEFLOW model. The results show that the parameter which is calculated by drawdown-distribution-coefficient can reflect the nature of the aquifer more better.