Research conclusions ： This paper summarizes the domestic and foreignnowadays construction technology of super large section tunnel， analyzes the mechanical behavior of tunnel constructive process， establishes measures of advanced support，support parameters of lining and constructive methods，the main conclusions are as follows ： (1) The construction of super large section tunnel in stratum of completely weathered granite with abundant water is difficult，high security risk and high cost， should be combined with specific conditions of tunnel engineering to develop practical supporting measures and construction methods. (2) To control primary support deformation and primary supporting measures conversion of super large section tunnel in stratum of completely weathered granite with abundant water， large wall foundation and multiple supporting measures are necessary* (3 ) In order to control deformation of soft stratum with abundant water， deformation and collapse of super large cross section tunnel， should adopt strong advanced reinforcement and reinforcement measures of tunnel face* (4) The relevant research results can provide reference for the design and construction of the super large section tunnel in soft stratum.