中文摘要：

文章综述了脲醛树脂加工中，通过降低甲醛与尿素的物质的量比、改进合成工艺、添加改性粒子等几种方法，降低游离甲醛毒性，并对脲醛树脂加工改性方面存在的问题进行了总结和展望。

英文摘要：

Some methods used to decline the toxicity of free formaldehyde for preparing urea-formaldehyde resin （UF） were reviewed in this paper, such as decreasing the molar ratio of formaldehyde to urea, modifying synthesis methods and adding modified reagent. Additionally, the existing problems and future trend in this field were summarized.