The key technique of jointing different measure station\'s data cloud is introduced in 3D laser scanner researching in the paper.

The 3D laser scanner can get the points cloud of target based on the relative coordinate system,which cannot satisfy the applications straightway when the geodetic coordinates are needed.

3D laser scanning is a new laser surveying technique to acquire the 3D landscape model of object based on the nearby view scanning.

With the rapid development of data acquisition techniques,especially 3D laser scanning,surface models of any object constructed by modeling approaches become more and more elaborated,which result in great amount of data to be stored,and decreasing the speed of processing models.

3D laser scanning technology is a new technology of surveying and mapping,it has changed the traditional way of data acquisition,and remedied defects of traditional methods in the field of historic buildings and relics.

3D laser scanner and its effect factor analysis of surveying error;

Accoding to the characters of similar material model of mining subsidence,the model is observed by 3D laser scanner.

The orientating technology of the total station\'s traverse survey is introduced into the 3D Laser Scanner in order to solve the problem that the 3D Laser Scanner can not get the objects\' geodetic ordinates directly.

With the wide application of the three-dimensional laser scanner in engineering,this technology has attracted the attention of many researchers.

Then,this issue defined measurement accuracy of three-dimensional laser scanner measurement in engineering applications,preparing for final acceptance of the steel structure project by Three-dimensional laser scanner measurement.

It put forward some conclusive opinions on 3D laser scanning technology based on the application and experiments in civil engineering.