The invention relates to a compound expression fire grate system with subsection drive, which characteristic lies in: the incinerator has divided into the dry section (1), hot region (2), burn cinders section (3) in turn from high to low, the height fall has existed between each section; underneath the dry section, the hot region and the burn cinders section separately establishes the unaided once-wind chamber (9, 11, 13) and the respective driving mechanism (8, 10, 12); the fire grate piece of the dry section (1) and the burn cinders section (3) is the push type arrangement, the fire grate piece of the hot region (2) is the counter push type arrangement. The invention divides the fire grate into the dry section fire grate, the hot region fire grate, the burn cinders section fire grate three parts; each section not only has the unaided driving system, the wind system and the wind chamber, and is advantageous for the independent control; moreover the height fall exists between each section, is advantageous for the further scatter, turn over and agitation when the trash falls.