Abstract: The distributed optical fiber strain test technology is used to carry out wellbore wall deformation monitoring during the grouting behind the wellbore wall. The real-time data of wall strain during the period of grouting is obtained. The data analysis shows that, during the grouting behind the wellbore wall, the deformation of the wall is mainly compression deformation, which has increased, and the growth of strain mainly happens during early stage of cement grouting and chemical grouting stage. In the process of cement grouting, the wall strain tallies with the grouting point position, which explained that the diffusion distance of cement grout is limited. During the chemical grouting, there is difference between the focus position of strain growth and the location of grouting points, which shows that the spread distance of chemical grouting is farther.