According to the main diseases of the ontology of the site of Kizilgaha Beacon Tower, the OKIO-Ⅱ grating three-dimensional scanning system was used to monitor the characteristics of high-precision disease changes 8 times for 14 months. From the monitoring data, it was found that the annual shrinkage of the site body is relatively large. The north facade suffers the largest shrinkage and the most serious weathering, followed by the west facade; the south facade has the smallest shrinkage. The effect of gully erosion shrinkage on water flow is smaller than that of weathering, and the disease characteristics are as follows: the erosion amount along the central line is large while that of the gully sides is small; the erosion amount on the top is large while that of the bottom is small. The development rate of etching disease ranks the first. The deep shrinkage in the etching area changes greatly at both ends and the change in the middle is small. Fracture disease expansion is small, but most is transverse expansion while a few show transverse shrinkage phenomena. The overall trend is expansion. At present, the main diseases developed at the site have not affected the overall stability of the site, and the research provides an effective data support for the selection of site protection measures.