Fruhstorferiola tonkinensis Will.is a native grasshopper species which has been eruptive in the north of Guangdong Province, China, during the latest 10 years. This species of grasshopper prefers plants which growing at the flood land of riversides. After a field all-investigationon plant communities of the riversides in northern Guangdong province where F. tonkinensis population had been outbreak heavy using all-survey method, 106 species of plants belonging to 43 families had been identified, and some indexes of plants in those plant communities including flora, average height, congregation index, total coverage rate, phenological phase and biod were noted. Simultaneously, plant comparability, plant abundance, quantity character and attribute symbol of dominant species of riversides′plant communities were analyzed. The results showed that the vegetation systems in riversides offered a favorable habitat for F. tonkinensis. The density of 1stinstar nymph grasshoppers in plant communities was sampled and a partial correlation analysis (PCA) on the relationship between plant communities and outbreak of F.tonkinensis showed that Pterocarya stenoptera C. DC.is most palatable plant to F.tonkinensisdue to its significant positive correlation with the population densities of F.tonkinensis,the partial correlation coefficient (PCC)= 0.856, F=32.920,P=0.0001; while Bambusa flexuosa was non-preferable plant of F. tonkinensis and PCC= -0.613,F=0.1617,P=0.021. On the basis of the characteristic of outbreak of F.tonkinensis, a series of ecological control methods were discussed preliminarily.