Abstract: The format “Preposition+X+direction words” is a controversial issue in the research field of modern Chinese grammar.As to the nature of format,we think that the direction word is not used independently,but a word holding the sense of,direction word,half –bearing,and non-direction.It develops from direction word into non-direction word along the Chinese grammar way.The format is construction of preposition-object.Through the key comments on Looming Research on Modern Chinese Direction Word by Fan Haiyan,it is thought that the looming research about direction word in the format has not been settled and it needs to be explored further.

Key words: preposition + X + direction word, nature, looming mechanism