In order to elementarilly discuss the experimental design and research method of energy dissipator of suspension gird in stilling pool，the paper used uniform orthogonal experiment to design 3 influence factors such as suspension gird high hs, suspended grid spacing bs and number ns of the maximum water depth in the condition of design flow of Q being 8.0 L/s，and took projection pursuit regression method to carry out analysis of setting up model and computer simulation optimization.The results are that the first influence factor of the maximum water depth in suspended gird stilling pool is number ns, and followed by suspended grid spacing bs，the last is suspension gird high hs.When the maximum water depth reaches the value of 18.233 cm in stilling pool，the optimum combination of influence factors is suspension gird high hs=9cm,uspended grid spacing bs =5cm and number ns=16.