Abstract: As a flocculant enhancing the cementitious process in pure cement solidification method (PCSM), polyacrylamide (PAM) modifies the microstructure and mechanical properties of cement mortar.However, its effects on the workability of PCSM-treated silt remain insufficiently studied.To address this, experiments were conducted on an inland lake dredged sludge to assess the fluidity, viscosity, and unconfined compressive strength of solidified silt with varying water-cement ratios and PAM incorporation.The study aimed to clarify PAM's influence as a flocculant on the flowability and mechanical properties of solidified silt.Results show that PAM significantly reduces the flowability of PCSM-solidified silt while increasing its viscosity, and initial water content exerting a greater impact on flowability than the solidifying agent dosage.For PAM-modified solidified silt, a water-cement ratio above 14 is recommended to meet construction requirements.In the flocculation-solidification combined method (FSCM), viscosity initially increases and then stabilizes with mixing time at low moisture content, whereas it remains relatively constant at high moisture content.The unconfined compressive strength of FSCM-treated silt increases slightly over standing time, surpassing that of PCSM-treated silt, and finally they are close to each other.