Abstract: To promote biomass industry chain, and to develop biomass energy, so it can be fully effective use of forestry organic wastes. Rice hull carbon which is produced by microwave pyrolysis, this topic used it to produce high quality rice hull activation carbon through chemical activation method. Choose Alkali fusion (NaOH) to remove SiO2 in the rice hull carbon, and solid carbon by chemical activation method to prepare high-quality activated carbon. Select activator quality ratio, dipping time, activation temperature activation temperature and activation time as effective factors, each factor has 3 levels, the process condition of producing activation carbon is optimized through orthogonal test. Iodine adsorption value is the foremost measurable indicators of quality. Determine the best activation conditions through single factor and orthogonal experiment .The best activation conditions indicated are as follows: activator-NaOH, carbon alkali ratio was 1:2, dipping time was 24 h, the activation temperature was 700℃, activation time was 2 h. According to the mensuration, rice hull activated carbon iodine adsorption value was 965.22 mg/g, and it exceeded the water purification using activated carbon National Second Grade indicators. Methylene blue adsorption value was 148.50 mg/g, and it reached the water purification using activated carbon National First Grade indicators.