Abstract: This paper designs indoor experiments for CL-C clay cement slurry, and uses a rotary viscometer to conduct experimental research on the rheological model of the slurry, the apparent viscosity and the time-varying law of shear stress. The following conclusions are drawn by analyzing the test data: 1) CL-C clay cement slurry is a non-Newtonian fluid, the ratio of the slurry affects its rheological constitutive model, the part distribution is more in line with the Bingham flow pattern than the slurry, and some are more in line Yield pseudoplastic fluid flow pattern. 2) The apparent viscosity and shear stress of CL-C clay cement slurry have a time-varying law and conform to exponential growth.3)The apparent viscosity is affected by the shear rate. At the same time, at low shear rates, the apparent viscosity The growth rate is faster and the increment is larger, while the opposite is true at high shear rates. This research has practical significance for the selection of grout ratio and grouting speed in grouting engineering, and can effectively guide the construction of grouting engineering.