以碱法草浆造纸废液为原料，通过甲醛缩合与接枝增效等一列系反应，制备出了ＪＣＦＪ粉状降滤失剂。评价了ＪＣＦＪ在泥浆中的降滤失性能与抗盐、抗钙能力，介绍了ＪＣＦＪ的现场应用情况。结果表明，ＪＣＦＪ在淡水或矿化度较高的泥浆中均有较好的降滤失作用，与其它处理剂的配伍性良好，是一种价格低廉的降滤失剂。 Using alkali straw pulp papermaking waste as raw material, JCFJ powdery filtrate reducer was prepared through a series of reactions such as formaldehyde condensation and grafting efficiency. The JCFJ filtrate loss performance, salt tolerance and calcium tolerance were evaluated. The field application of JCFJ was introduced. The results show that JCFJ has good filtration and loss properties in fresh water or mud with high salinity, and has good compatibility with other treatment agents. It is an inexpensive filtrate reducer.