本文选用箱3 种热水预抽提H-因子（0、500 和1 000）和合适的蒸煮有效碱用量，得到卡伯值相近（20）的3 种竹子硫酸盐纸浆（KP浆）；然后，采用DQP（二氧化氯漂、螯合处理、过氧化氢漂）漂序，通过变化二氧化氯用量和过氧化氢用量，对比漂白浆的白度、返黄值、卡伯值降低率、黏度。发现热水预抽提可以提高纸浆漂白过程的卡伯值降低率；相同总有效氯因子下，漂后浆的白度较高，返黄值较低，黏度相近；达到相同白度（85 %ISO）可节省约1.4 %的总有效氯用量，然而返黄值略高。

In this paper，three hot water pre-extraction H-factors (0，500 and 1 000) and applicable digestion effective alkali dosages (15 %，18 % and 21 %) were selected to obtain bamboo kraft pulps with similar Kappa number (20). The effect of hot water pre-extraction on the elemntal chlorine free（ECF）bleaching performance of bamboo pulp was studied，through comparing brightness，post color (PC) number，decreasing rate of Kappa number，viscosity of bleached pulp with same brightness (85 %ISO) and beating degree (45°SR) under different dosages of chlorine dioxide and hydrogen peroxide. The results indicate that hot water pre-extraction before kraft pulping could obtain higher decreasing rate of Kappa number，higher brightness，lower PC number，similar viscosity of bleached pulp at the same total active chlorine factor.For the same brightness bleached pulp (85 %ISO)，hot water pre- extraction could save 1.4 % bleaching chemical，but the PC number was slightly higher.