Abstract: Based on the five point method,four species of bamboo which are widely distributed in Yibin named Bambusa rigida,Bambusa pervariabilis,Neosinocalamus affinis and Bambusa intermedia were investigated.According to the fresh weight,total fresh weight and economic benefit analysis,the conclusions were drawn as follows:1)The mean total fresh weight of the four species of bamboo was presented as:Neosinocalamus affinis＞Bambusa pervariabilis＞Bambusa intermedia＞Bambusa rigida.When the fresh weight of different stages annual,biennial and perennial one were compared,the annual bamboo fresh weigh was at the highest while the perennial was the lowest.2)The total fresh weight and the different stage fresh weight showed highly correlation where the total fresh weight and the biennial weight of Bambusa intermedia presented the significant correlation with the correlation coefficient 0.943.3)The economic benefit result showed that the Neosinocalamus affinis was the best,and the Bambusa pervariabilis was not economical.The other two species of bamboo were at almost the same condition.Further analysis showed that the economic benefit ratio of the annual Bambusa pervariabilis was as high as 44.58%,and the perennial stage accounted for the smallest proportion 22.78%.

Key words: fresh weight of bamboo, bamboo industry, economic benefit, Yibin city