In view of the poor durability of traditional cement solidified soil, the unconfined compressive strength test, dry-wet cycle test, dry shrinkage test and SEM electron microscope scanning test were carried out on the cement solidified sand with three different water absorption properties of polyacrylamide (PAM). The strength, durability and microscopic mechanism of PAM with different water absorption properties to improve cement solidified soil were studied and analyzed. The test results show that the incorporation of PAM can effectively improve the strength of cement solidified soil, and the different water absorption properties of PAM will lead to a certain regular change in the strength of cement solidified soil. The incorporation of PAM can effectively improve the durability of cement stabilized soil. Relatively speaking, the strong water absorption PAM shows a better impact on the durability of cement stabilized soil. After PAM is mixed with cement solidified soil, the overall cementation structure of PAM-cement stone-soil particles is formed, which enhances the strength and dry shrinkage cracking resistance of cement solidified soil.