TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The method comrpises (a) collecting sucrose feed domesticating housefly by placing wild housefly in milk powder in a mass ratio of 1:1, feeding sugar, cultivating larva by adding into clean wheat bran, and naturally sub-culturing the larvae into 5 generations or more having stable propagation characteristics; (b) mechanically grinding the bagasse into 400 meshes, destructing the lignin structure, adding wheat bran and water having into bagasse culture medium having water content of 50-90%, under ambient temperature of 20-30 degrees C, culturing under relative humidity of 50-80% after domestication of housefly larvae, inducing bagasse into the culture medium, where the mass ratio bagasse powder and wheat bran added into culture material, is 1:9, and slowly increasing the addition amount of bagasse powder and wheat bran in a mass ratio of 5:5, and culturing into 5-10 generations, where during each generation of cultivation process the fly lays egg, bagasse added into culture medium to induce culturing process, separating 3-day-old larvae, carrying out pupation to obtain fly, and adding milk powder, feeding sugar to lay eggs, and increasing the addition amount of bagasse powder and wheat bran in a mass ratio of 5:5, and the mass ratio of bagasse powder and wheat bran, to 6:4, and culturing into 10-15 generations, where each generation process includes cultivation process the fly lays eggs, bagasse added into culture medium to induce culturing process, separating 4-day-old larvae, carrying out pupation to obtain fly, and adding milk powder, feeding sugar to lay eggs, and then obtaining housefly with biological characteristics of housefly life according to each calendar achieves a natural or wheat bran feeding growth standards, and obtaining converted bagasse fly strains; (c) inoculating larvae of converted bagasse fly strains into culture medium containing bagasse powder and wheat bran in the mass ratio of 6:4 to carry out the breeding process, and then randomly forming groups, where each generation contains crude fiber content in the culture material as determined by lowest group of pupation into flies, genetically screening the high expression fly strains secreting cellulase, where the crude fiber content in the culture material is less than 15%, and feeding for 3-5 generations, and then obtaining of stable high expression fly strains with cellulose; (d) placing stable high expression fly strains with cellulose in 60% bagasse, 20% wheat bran, 5% pig oil, 5% sucrose and 10% protein auxiliary materials, and propagating under high fiber, high sugar and high fat environment, and obtaining cellulose after circulation for 10-15 generations, where each generation process includes cultivation process the fly lays eggs, bagasse added into culture medium to induce culturing process, separating 4-day-old larvae, carrying out pupation to obtain fly, and adding milk powder, and feeding sugar to lay eggs, and finally obtaining high expression fly strain with dual lipase; (e) mechanically grinding bagasse into 400 mesh, and adding white rot fungus in concentration of 106-108/ml of culture liquid, water and bagasse powder in mass ratio of 1:1:20, and mixing for 8 hours, and activating bagasse powder and un-fermented bagasse powder in a mass ratio of 1:500 by mixing, and starting the fermentation process for 1-3 days, to obtain modified bagasse powder, and adding a pH adjusting agent into molasses in a mass ratio of 1:0.8-1.2, and adjusting the pH to 6.5-7.5, heating the filter mud at 70-80 degrees C, washing with an equal volume of water, removing cane wax, and adding modified bagasse powder, honey, filter mud, wheat bran or bran and protein, and regulating until the water content is 65-75%, and obtaining industrially produced fly maggot as base material, which meets the industrial standards of maggots feed; (f) adding cellulose and lipase into maggots feed, and allowing the breeding process, and then circulating 10-15 generation stable industrially transformed bagasse fly strains, where where each generation process includes cultivation process the fly lays eggs, bagasse added into culture medium to induce culturing process, separating 4-day-old larvae, carrying out pupation to obtain fly, and adding milk powder, to obtain transformed strains maggot flies industrial products; and (g) drying the fly maggot industrial product residual material to obtain functional organic fertilizer, and preparing animal health feed by using housefly larvae and adult flies or biomedical materials or products by carrying out biotechnology processing. The steps (vi) and (f) comprises introducing industrially transformed bagasse fly strains with stable cellulose every 20 days, and introducing high expression fly strain with dual lipase in an amount of 3-5%/cage, and preventing the degradation of fly strain in industrial bagasse. The method comprises adding filter mud obtained from carbonate into industrially produced fly maggot, in a mass ratio of 1:1, and adding weak acid into organic waste water. The step (b) comprises slowly increasing the mass ratio bagasse powder and wheat bran added into culture material, to 1:9, and slowly increasing the addition amount of bagasse powder and wheat bran in a mass ratio of 5:5, and culturing into 5-10 generations, where during each generation of cultivation process the fly lays egg, bagasse added into culture medium to induce culturing process, separating 3-day-old larvae, carrying out pupation to obtain fly, where the survival rate of maggots in each larvae is more than 25 mg or more, and then transferring the larvae into next proportion, and increasing the addition amount of bagasse powder and wheat bran in a mass ratio of 5:5, and the mass ratio of bagasse powder and wheat bran, to 6:4, and culturing into 10-15 generations, where each generation process includes cultivation process the fly lays eggs, bagasse added into culture medium to induce culturing process, separating 4-day-old larvae, carrying out pupation to obtain fly, where the survival rate of maggots in each larvae is more than 25 mg or more, and then continuously culturing for 3-5 generations in a proportion ratio manner, and obtaining strain having stable physiological state, then entering into the next matching ratio. In the steps (a), (b) and (d), the domestication process comprises carrying out induction process by performing engineered breeding process by adding bagasse into wild housefly, cultivating, inducing and domesticating the housefly larva under intensive feeding time to facilitate normal growth, where the feeding rate includes every 10 kg bagasse of culture material is fed to 150 g breeding maggots, and each larvae amunt in 3-day-old maggots, is 25 mg or more, and obtaining the product. The step (f) comprises converting bagasse by using industrially stable fly strains by taking housefly larvae modified bagasse powder as a bottom feed facilitating growth and reproduction of maggot, and culturing 350 g larvae by adding 10 kg bottom culture material, and obtaining larvae each weighing 25 mg or more. Preferred Components: In the steps (v) and (e), the filter mud used is filter mud obtained from sulfitation process or filter mud obtained from carbonate process. In the step (v), the pH adjusting agent is sodium bicarbonate or limestone. In the steps (iv) and (v), the protein auxiliary materials used is dry maggot powder, corn powder, rape seed cake or soybean meal.