Based on the analysis of meteorological conditions during the growth and development of grasshoppers in Inner Mongolia, the key physiologicalmeteorological factors at the main growth and development stages of grasshoppers are selected to construct the meteorological suitability index of grasshoppers which is used to predict the meteorological grades for the growth and development of grasshoppers. The average prediction accuracy of meteorological grades is 68%. Through calculating the meteorological suitability index and predicting the meteorological grades for the growth and development of grasshoppers, based on the meteorological data from meteorological stations over the grassland in Inner Mongolia, the spatial analysis of the meteorological conditions and the growth and development of grasshoppers can be made. The application proved that the index is simple, convenient, and useful in operational service.