Based on the dynamics theories of the Solid-Liquid Systems, considered the needs for drilling and the principles of carry and suspend formation cuttings, this paper discussed a reasonable method for the calculation of permitted rheological parameters control window of drilling fluid under certain given assumptions, established corresponding computational model, and finally, developed the corresponding calculation software. The calculation results show that any one of the drilling fluid density, displacement, plastic viscosity and mud pump cylinder liner bore increases would lead to the permitted rheological parameters control window turn out to be narrow. The influence of drilling fluid displacement on regulation range is particularly evident. Mud pump displacement is the main factors which affect the maximum range of the permitted rheological parameters control window. And the lower range is mainly controlled by the drilling fluid density.