Abstract：The optimization of anchoring parameters for large underground houses is of some characteristics. For example，the object of stability is incompatible with the object of economics，so that the stability analysis of large underground houses is very complicated，and the assessment indexes are required to denote anchoring effect roundly. Further more a lot of schemes with different anchoring parameters will occur and a great deal of calculation is needed. Aiming at these characteristics，large scale numerical simulation is made with FLAC3D，combined with genetic algorithm and NN，and a new evolutionary NN limited difference method is proposed to optimize the anchoring parameters for large underground houses. Constrained conditions and optimization goals are constituted，and the optimization process is proposed. Using above method，the anchoring parameters of Shuibuya underground houses between the third and sixth construction step are optimized for the underground houses of Shuibuya Hydro-Power Station，which proves that the proposed method is feasible.
