Abstract: Agriculture investment level is one of the major indexes that determine agriculture modernization degree.This paper is a regional comparison and correlation analysis between application of energy input level,index funds and index of farming and animal husbandry in Inner Mongolia investment level and the output effect.The results showed that agricultural investment rose from 97.6 to 121.2 in Inner Mongolia province from 1990 to 2007,which was lower than average level of eastern China（123.1）,of central China（123.8） and of western China（123.8）.Inner Mongolia comprehensive modernization level ranked 17 in the whole nation,and first modernization level ranked 13,being the first among five autonomous regions of ethnic minorities.The results of this study can provide a reference to promote agriculture modernization level for other regional and national minority areas in China.