Abstract: It is necessary to circulate out the kick from a well promptly in order not to result in blowout in case it is traced. This paper introduces some factors involved in kick simulation with computers. Printed with the line printer is the information including both input data and simulated results such as casing control pressure, gas column hight, pressure at any interesting depths, gas top depth and pressure drop in annuli. All above data are tabulated and plotted against the pump volume.