Based on previous study on the catogary of Mongolian verb voice and guided by modern linguistic theory and approach , this paper mainly uses descriptive methods to expounds the syntactic function of the modern Mongolian language verb voice.

Taking the modern Mongolian"words"as basic unit,mis dictionary organizes and records their varieties of semantic information in language use.

The legal system of the ancient Mongol nationality can be generally divided into five stages,in which the provisions of the protection of water,wild animals,grassland,trees and other natural resources are connected with the production and life about the ancient Mongol nationality through exploring the existing historical documents.

This article mostly uses the method of depiction, try to analyse the using confine、meaning、function change of Mediaeval Mongolian Language Dative Case.