We study the main physical and mechanical properties of mud-hardened soils by a combination of laboratory experiments and field tests.We propose that the curing agent content and the gravity of the mud are the two major quality control points that affect the mud-filled filling bags.Through the analysis of the curing effect of different curing agents,the curing effect of L curing agent is obviously better than that of ordinary 32.5 cement and S1～S3 curing agent.According to the field test results and the design function requirements of the embankment,considering the aspects of economy and quality control,L curing agent theoretical content can be controlled at 7%.