This paper studied that when cooking without heating, by using cold cooking liquor(80℃)to preimpregnate wheat straw and mechanical pulping, it can got high-yield pulp. On this basis, bleached the soda preimpregnated straw pulp, we used the EOPDP bleaching method, and studied the bleaching process condition, then compared with CEH three-stage bleaching processes, the result showed that the optimum conditions bleaching EOPDP was got, under the best conditions in the cold preimpregnated, wheat straw alkali bri...