Abstract: A well produced with oil and water may form oil?water and oil?gas contacts during test of shut in pressure recovery due to early oil, gas and water differentiation in the wellbore, and the contacts will appear in continually rising. For the saturated reservoir, they will appear in gradually moving down in late shut?in period. When the test pressure gauge is situated far away from the midpoint of pay zone, the pressure recovery rate of measured point tends to being less than that of the midpoint of pay zone in the process of these contacts moving up to and over the pressure gauge; while during the contacts moving down to and below the gauge position, it is generally greater than that of the actual reservoir. In the period of time of measuring point pressure and formation pressure recovery occurring in out?of?step, the measured pressure will be abnormal. Such an abnormal fluctuation may impact the accuracy of pressure data and increase the difficulty of data processing. And the serious impact can not allow the pressure data to be used. Hence, the pressure data restoration is necessary, in order to remove them and improve the quality and interpretation accuracy of test data, making the useless information become useful data