Wheat straw was cooked at low temperature (85 ℃ ) by alkaline-oxygen method, and the pulp was then bleached by hydrogen perxoide under pressure and low temperature (80 t ). We got the pulp with 86.6 % -89. 5 % yield after bleaching, and the pulp brightness was significantly risen to 45.6 % from 60.6 %. The Kappa number of bleached pulp dropped from 17. 9 to 9.4-11.9, and interestingly, the pulp viscosity slightly increased from 1 042 mL/g to 1 158-1 192 mL/g,which is different from the traditional bleaching. The brightness has certain linear relationship with Kappa number; brightness increment = Kappa number decrement× 1.57; meanuhile there is a standard linear relationship between yield decrement and Kappa number decre-ment:yield decrement = Kappa number decrement ×0. 19.%对麦草在低温(85℃)下氧碱蒸煮,所得草浆在较低温度(80℃)下进行压力过氧化氢漂白.漂白后浆料卡伯值从17.9降至9.4～11.9；黏度比漂白前浆料黏度稍有增加,从1 042 mL/g增加到1 158～1 192mL/g；纸浆白度(ISO)从37.1％升高至45.6％～60.6％,且与卡伯值之间具有一定的线性关系:白度增加=卡伯值降低×1.57；浆料得率在86.6％～89.5％之间,同时得率降低与卡伯值减少之间具有较为标准的线性关系:浆料得率降低=卡伯值降低×0.19.
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