Abstract: In order to study the influence of PS-C grout with different C/W ratios on its groutability to different fractures of Jiaohe ruins, the grouting pressure and effects are discussed. Based on the data of experiments, a conclusion is drawn that when the fracture width is larger than 1 cm, the grout with 0.6 C/W ratio should be used. When it is 0.75 cm to ~ 1 cm, the grout with 0.65 C/W ratio should be used. The grout with C/W ratio of 0.7 should be used when the fracture width is between 0.5 cm and 0.75 cm. When it is smaller than 0.5 cm, the grout with C/W ratio of 0.75 should be used.