Abstract: In-situ curing is a shallow soft soil treatment technology that has been gradually applied in recent years. In this research, through indoor and field experiments, the application of in-situ solidification in the treatment of river pond sludge and the strengthening mechanism were studied. The research shows that the combination of strong stirring heads for the in-situ improvement and solidification of river pond sludge can improve the improved sludge. Further processes such as roadbed filling are carried out directly on the roof to realize the on-site resource utilization of the sludge, and at the same time reduce the amount of external spoil and borrow the earth, which is conducive to environmental protection and cost saving. The strengthening mechanism shows that the cement distribution in the solidified soil treated by the powerful mixing head is more uniform than that of the conventional method, so that with the same cement content, higher strength can be obtained.