The results of bleaching wheat straw pulp were analyzed using the method of microwave radiation. The results showed that bleaching time, surplus peroxide and the pulp viscosity were lessened compared to bleached pulp of microwave radiation with water bath experiment. The influence of peroxide dosage on bleaching pulp is the most obvious, and the next is irradiation time and NaOH, and irradiation power is the least by orthogonal experiments of four factors. The most optimum conditions are, irradiation power 240W, reaction time 25min, H2O2 5％, and NaOH 4％. The pulp brightness is about 59％, pulp viscosity is more than 620?mL·g-1, and K value is 390.