Abstract: In order to explore the optimum technological parameters for biological drying of MSW，fresh household garbage was used as materials of biological drying in Dongcun village waste disposal field for biological drying pilot test． The optimum parameters were determined by measuring effects of the orthogonal tests on piled height，initial moisture content，aeration mode，and turning method． The result shows that the influencing factors sequence by their effect on biological drying for MSW is as follows: turning method ＞ aeration mode ＞ initial moisture content ＞ piled height． The optimum technological parameters group for biological drying is as follows: a piled height of 1. 5 m，initial moisture content of 60%，aeration time of 10 min ( ON) /30 min( OFF) ，and pile turning frequency of 1 time for 2 days．