Abstract: The form of "Jiao" is one kind of passive forms which formed and developed in the south of our country.It was transformed from the variation of the causative form of Jiao,and also was influenced by the assimilation of Chinese passive form and pulling effect of methods of showing the passive form in Altai language.The form of "Jiao" sprouted in Middle Age,rapidly developed in the recent antiquity time,,nowadays it has became the most main marked passive form in the northern dialect.