Characteristics of construction survey: (1) Construction survey directly serves the project construction, so surveyors must understand the construction organization and scheme, master the construction progress, and make the survey work meet the requirements of construction progress. (2) Construction survey is closely related to engineering quality. The surveyors must be familiar with the drawings, check the lofting data repeatedly, carefully check the instruments and tools before lofting, formulate the measurement scheme, and conduct effective recheck after lofting to ensure the engineering quality.

(3) The accuracy of construction survey mainly depends on many factors such as the nature, use and construction method of the building. It is necessary to refer to the relevant engineering survey specifications and combine the engineering practice to formulate a reasonable survey scheme, so as to ensure both accuracy and economy.

The construction site is mostly cross-working between the ground and various types of work at high altitude, and there are a lot of earthwork filling and digging. In addition, there are frequent stacking of materials, power machinery and vehicles, and the ground conditions change greatly. Therefore, it is necessary to consider the convenience of use, storage and inspection from the aspects of the form, selection and burial of survey marks, and restore them in time if they are damaged.