Abstract: In gas well testing process, borehole fluid flow distribution is inconsistent under different work regimes. In wellhead shut?in pressure survey, the pressure gauge distance from middle part of a reservoir, phase state differentiation and gravity differentiation have some impact on shut?in pressure data. Based on bottom hole pressure changes recorded in process of a gas well testing, this paper analyzes such fluid flow variation and the causes of little pressure drop after shut?in. it is shown that the process of bottom hole liquid loading at early shut?in and liquid submerging the pressure gauge appears slope line that measured points deviate from theoretical points in the double logarithmic early diagnosis diagram. The results are of a certain significance for pressure data analysis and processing