Abstract: By using core flow experimental apparatus, the two-phase fluid flow threshold pressure of four samples in Xujiahe gas reservoir has been tested. The laboratory findings indicate that the minimum threshold pressure of tight sandstone and flow rate are of power function. The minimum threshold pressure of second part of Xujiahe reservoir is 0.03279MPa/cm, the threshold pressure in fourth part of Xujiahe reservoir is lower than in second part of Xujiahe reservoir, which demonstrates a close relation with water saturation and mixed seepage regularity.