Abstract: In this paper, surface hardness method is used to test the specimens with different water content made of two kinds of grouting materials. The converted strength curve was developed and the least square method was used to analyze the linear regression. The test results show that the compressive strength of grout decreases gradually when the water-cement ratio of grout increases from 12% to 14.4%, but it has little effect on the surface hardness. There is a positive correlation between grout surface hardness and compressive strength.