Abstract: Deformation monitoring is an important way to monitor the deformation safe or not,but conventional ground survey method has a long monitoring period and is difficult to achieve remote real-time monitor.Hydrostatic level measurement has higher measurement precision and can realize real-time monitor.According to the deformation data of surface building in the experimental region, the temperature effect,the delayed effect, the liquid material effect of the measurement system have been studied detailedly,the correction models of the effect factors have been established.As it is shown in the data analysis,if filling liquid is glass-water, hydrostatic level measurement has higher measurement precision after correcting the effect factors.The height determination precision can achieve 0.19 mm,the level difference precision can achieve 0.08 mm.