Abstract: The chemical grouting process affects the quality of crack repair, and there is a high risk of corrosion in a corrosive environment when the repair material is not covered with reinforcing steel. Leakage often occurs after concrete crack chemical grouting with current operation specifications, indicating that the durability of concrete structures is not guaranteed in a corrosive environment. The grouting repair effect of borehole grouting technique commonly used in engineering is analyzed through experiments. From the perspective of durability guarantee, the grouting process optimization test is conducted in terms of borehole spacing and borehole depth. The results show that shortening borehole spacing and increasing borehole depth can help improving the grouting effect. The borehole depth is the key factor for the grouting material coverage depth value limit. The corresponding process requirements are also proposed based on the durability index requirements.