In order to make up vacancy of words frequency on ancient bronze objects in Western Zhou Dynasty in diachronic development perspective, we sorting out some conclusions through the exhaustive statistical development data of words frequency diachronically. We found two ends concentration of word frequency in bronze inscription from the early to late in the Western Zhou Dynasty have decreased significantly, which reflects ideographic writing system increasingly mature trend; we also found the word frequency variation is keeping pace with the time trend. In other words, disappearance of those old words is the acceleration and appearance of new words has a trend for reducing the speed. We conclude that focus of inscriptions discourse topic did not change through each period distinctive word frequency semantic category research. Changes and development of language content is mainly caused by "social appellations", which always dominant semantic units’ substitutions and changes.