Abstract: In this paber,the formulas for rock resistant foctor "K" in circular pr-essure funnel by the plastie harding theory,plastic softenning-flaw theo-ry and Mohr-Goulomb yield theory separately is presented.Besids this,the relafion of they and it witch is in force brought to light.The differnce of internal pressure witch from saparate ly variaus modules by the theories iS painted to avoid fault in the selection of comlwtation modules.