Dam safety monitoring data analysis plays an important role in ensuring the safe operation of the dam, improving the management level, predicting and preventing potential risks. Based on the safety monitoring da-ta of the lower reservoir of Zhen ‘an pumped storage Power Station, the in-ternal deformation, stress and face deformation of the dam body during the construction period are analyzed. The results show that the internal deformation and stress change of the dam body are small, the deformation of the panel is small, and the construction quality of the whole structure is good. The research results can provide reference for the safe operation of the lower reservoir dam of Zhen’an pumped storage power Station and the safety data analysis of other similar projects.