Abstract: Fracturing characteristics and physical parameters of reservoirs can be acquired by analyzing pressure drop curves during mini-fracturing. But there are some defects of the commonly used methods of pressure drop analysis due to its unreasonable G function expression, unquantified filtration coefficient under the condition of natural fissure opening and weak effectiveness of the method for reservoir physical parameter calculation. Therefore, the reasonable selection method of G function expression on the basis of calculating fracture extension index is given at first. Then the method to calculate filtration coefficient with open natural fissures is modified and a method to analyze linear pressure drop after the closure of fissures is proposed to obtain reservoir physical parameters rapidly. The actual application results can verify the applicability and reliability of the improved method in tight reservoir fracturing analysis