This paper collected parameters of environment changes and rock mechanics by environmental investigation at the observation field of mobile level at Majialing,and calculated leveling height difference by load changes around an irregular load model. The results showed that the construction of the parking lot of Huoshan grand canyon rafting has some influence on the Majialing level observation. The influence effect is about 0.77mm,and close to 0.70mm difference from the observed height. The result shows from the point of view of quantitative simulation that the Majialing mobile level anomalies are caused by the surface load changes.