Abstract: In the field of converting simulation surveying and traditional close range photogrammetry,it has been developed so far to survey objects by commercial digital camera and this technique is applied widely in every part of production.In order to get three-dimensional information of objects,commercial digital camera must be examined.For a long time,digital camera has been examined by DLT.Then there must be a high-precision control field.For realizing surveying without control points,we take a method of self-calibration and achieve good results.