Abstract: Various impacting factors in the hydrogen peroxide bleaching of wheat straw chemomechanical pulp (CMP) were investigated. The optimized bleaching technology was as follows: 6% H2O2,20% pulp consistence,0.05% MgSO4,0.3% DTPA,5.0% Na2SiO3,3.5% NaOH,80℃ bleaching temperature,2.5 h bleaching time,with which the CMP brightness reached 53%(ISO). Based on the results obtained above, a new technology, i.e.,enzymatic pretreatment followed by high consistence two-stage hydrogen peroxide bleaching was proposed so as to further improve CMP brightness, to increase its additional value, as well as to develop its application.