Abstract: In the gas well productivity analysis,bottom-hole flowing pressure is very important parameter.Northeast sichuan river dike Feixianguan is abnormal high pressure gas reservoirs,the pressure meter can't be put in the well bottom,the well bottom pressure can only be calculated through well head pressure and productivity.Currently there are many methods to calculate bottom-hole flowing pres-sure,but under the influence of calculating model and parameter selection,gas well productivity are different,which bring great difficulty to determine productivity evaluation and rational production capacity.The calculation method of Kela 2 abnormal high pressure gas well bottom-hole flow pressure and natural gas open-flow capacity proved that well bore pressure-temperature mode is suitable for river dike abnormal high pressure gas well in the calculation of gas well productivity with the use of bottom-hole flow pressure and pressure-squared approach.Therefore the author se-lected bottom-hole flow pressure and pressure-squared approach to calculated the production capacity of rive dike H well and compared with other methods,the result provided scientific basis for the productivity evaluation and rational capacity of the study area.