In order to improve the synthetical utilization efficiency of bagasse, microwave assisted and catalyst oriented pyrolysis technology were adopted to investigate the process parameters which affect the furfural yield and the properties of the corresponding biochar. Biochars was then neutralized and served as soil amendent. The results showed that: the highest yield of furfural, 4.5% of dry bagasse mass was achieved when pyrolysis power was 900 W, phosphoric acid was 10%, sulphuric acid was 1% and the red earth clay was 100% of the dry bagasse mass. It was testified by FTIR that there exsisted organic phosphate bond and Si-C covalent bond in this porous biochar obtained under this experimental condition. The fertility of red soil was significantly improved by using the neutralized biochar: soybean planting percentage, plant height, dry weight of aerial part, dry weight underground part, root nodule number, pod number per plant were increased by 33.3%, 24.3%, 115%, 60%, 326% and 267% in the soybean pot culture test repsectively. Drought survival rate of Chinese cabbage seedlings, plant height, fresh weight and dry weight of aerial part, the fresh weight of underground part were increased by 2.3, 0.36, 12.3, 6.8 and 5.5 times, repsectively.