Abstract: Basic characters of digital holographic profiling including its system error, resolution, imaging depth, and the size lize limit of the recorded object are theoretically discussed in this papers. It is pointed out that the system error of digital holographic profiling is in proportion to the spuared size of he CCD chip and in inverse proportion to the recording distance. This paper also pointed out that the resolution of digital holographic profiling and the maximum size of the recorded object are all proportional to the size of CCD chip and in inverse proportion to the recording distance, while its imaging depth increases with the recording distance.