TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: Pretreatment of the agriculture and forest waste comprises crushing to particles with a grain diameter of less than 2 mm; sieving for removing impurity; selecting out granules with grain diameter of greater than 2 mm, and crushing; collecting produced mud, dreg, and dust; drying the sieved and impurity removed material by the heat energy provided by the product used as the fuel; and conveying the dried material to warehouse. Pretreatment of the household garbage comprises carrying out scratch treatment, applying a ground ditch to collected percolate produced in the household garbage field, and pumping the percolate to a wastewater treatment plant for subsequent treatment; conveying separated metal into a regenerating unit for recycling; dehydrating the magnetically selected household garbage, controlling dehydration rate at 40-70% according to moisture of crude material, and pumping to a wastewater treatment plant for subsequent treatment; processing gravity sedimentation of sludge produced during the wastewater treatment in the wastewater treatment plant for 3-6 hours in a concentrating tank, where the moisture of the concentrated sludge is greater than or equal to 90%, adding flocculant to a pipe conveying the sludge to a dehydrating device, and dehydrating such that the dehydrated sludge contains 30-50% moisture; roughly breaking the dehydrated household garbage into particles with grain diameter of less than 5 cm; processing vibrating selection of the initially broken household garbage to remove inorganic non-ignitable substance, and calcining the inorganic non-ignitable substance to bricks and plate construction materials; further breaking the selected material such that grain diameter is less than 2 mm; further squeezing the dehydrated sludge with the finely broken household garbage for dehydration, and controlling squeezing dehydration rate of the mixture at 25-45%, where the sludge and the household garbage are present at 5-20 wt.% and 80-95 wt.%, respectively; and conveying to a household garbage warehouse.