Abstract：Abstract：Accurate classification of surrounding rock mass is not only an essential problem for the highway tunnel¢s design and construction，but also a guidance to pre-forecasting the geology of surrounding rock mass precisely. It can provide considerable theoretical application and significance for the tunnel¢s construction and safety maintenance. In the current specification codes for the classification of surrounding rock mass in highway tunnel，corresponding specific connection between categories and evaluation indicators of surrounding rock mass is not established yet. In addition，actual application of the current codes is often affected by subjective factors. Aiming at the existing fuzzy problem in the current specification codes，firstly，a good deal of data pertinent to the classification of surrounding rock mass have been collected，analyzed and summarized，showing that quantitative classification of surrounding rock mass represents the international trend. Secondly，the concept of fuzzy information analysis model is brought forward here to deal with the fuzzy problem in the current specification codes by virtue of abundant information from actual examples. Then，expert system of fuzzy information for the classification of surrounding rock mass in highway tunnel is presented according to fuzzy mathematics theory and the current specification codes for the classification of surrounding rock mass in highway tunnel，which will make progress in quantitative classification of surrounding rock mass. Finally，the above new theory is applied to surrounding rock mass classification of highway Manxie tunnel No.3.
