As a class of important noninvasive intestinal robots,the current research on spiral inpipe robots at home and abroad is aimed at singlephase liquid flow environment.However,there exist some liquid foods in the actual intestine,the intestinal fluid should be liquidliquid multiphase mixed fluid.The operational performance parameters of inner spiral inpipes robots on liquidliquid multiphase mixed fluid,suah as axial thrust force,fluid dynamic load,circumferential resisting moment and maximum pressure of pipe wall,were numerically calculated by using computational fluid dynamics (CFD) method.The results show that when another evenly dispersed liquid of high viscosity is dispersed into the liquid pipe,the robotic axial thrust force,fluid dynamic load,circumferential resisting moment and the maximum pressure of pipe wall are increased with the increase of the concentration of the added liquid.When the added liquid of high viscosity is dispersed unevenly,with the increase of the concentration of the added liquid,the robotic axial thrust force is increased in the wave shape,and the circumferential resisting moment is also increased,but they are basically less than those in the case of the evenly dispersion of high viscosity liquid.