本文采用无毒磷酸盐溶液进行了低温封孔的研究.介绍了溶液的组成和处理方法.对封孔膜作了滴碱、喷砂、CASS、耐候试验以及裂纹试验等一系列的性能检验.又用离子探针对封孔膜层中的元素进行了分析,并展示了它们在膜层中的分布情况.最后,在实验的基础上,对本体系的封孔机理作了初步探讨. In this paper, non-toxic phosphate solution was used to study the low temperature sealing, and the solution composition and processing methods were introduced.Several performance tests were carried out on the sealing film such as dropping alkali, sandblasting, CASS, weathering test and crack test. In addition, the ion probes were used to analyze the elements in the sealing film and to show their distribution in the film.Finally, based on the experiments, the sealing mechanism of this system was discussed.