The basic approach to sewage sludge is: 1) organic waste reduction, 2)promotion of energy recycling; 3) volume and weight reduction by final treatment, and 4) environmentally final disposal of natural circulation. Dry of maize was experimentally investigated in bench-scale conveyer system in semi-continuous operation. The operational parameters varied are the operating temperature 16 0℃~170℃ of dry, the solids residence time 40~60min for dry. Important parameters studied include the running time, water content of sewage sludge, particle size of sewage sludge, solids amount of sewage sludge(TS%) by the varied temperature. This study was conducted to investigate the drying tine of vapour velocity and water content of drying time by varied temperature.