Abstract: In order to find out the factors influencing errors of photogrammetry and reduce them to the minimum,experimentations were carried out with three digital cameras which are representative in optical constitution and imaging quality,five different photographing distances and four objects.Then,the data obtained under different conditions was processed using qualitative analysis,quantitative analysis and validity check.From the results it can be concluded that the factors affecting the accuracy of human body photogrammetry include the optical constitution of the camera,manual operation,and subsequent measurement etc.Optical error is basically conformed to the law of spherical surface deformation.According to the analysis results the suggestion to choose suitable digital camera and optimize the measurement software for getting good results was brought forward.