The study of Chinese characters structure has always been one of the basic problem of Chinese philology. Because of the limitations of information and methods, previous scholars mostly rests on the static analysis of individual or stage Chinese characters. Therefore, they can’t overall research the development of ideogram. On the basis of full possession of ancient texts, and through the dynamic analysis of the way that ideograms are constructed, we can find that the ideogram has always been in dynamic development. In the early stage of ancient writing, most ideograms are combinations of imageries. However, after Qin dynasty characters, the pictographic feature of Chinese characters are greatly reduced, and most of the ideograms are linguistic type. Beginning with the oracle inscriptions in Shang Dynasty, ideograms had tended to be semantic-plus-phonetic. And there were varied ways to achieve this transformation. This trend was gradually strengthened by Zhou dynasty, and it reached the peak in the Qin and Han dynasties.