In view of the problems of land occupation and environmental pollution for Chaohu slit treatment，as well as the impact of engineering construction on the environment，we study the dewatering，solidification and tube filling of Chaohu silt using the geotextile tube technology. Taking the volume，density and supernatant of the flocculant as the evaluation indices，we use the single factor analysis method to conduct the flocculant pilot tests design and result analysis. The results show that the flocculant based on cationic polyacrylamide is suitable for the treatment of Chaohu Lake silt dewatering effect，the optimal dosage of 0.5% concentration of flocculant is 1 mL/100 mL mud in Chaohu，and the optimal dosage of curing agent is 10% of the dry weight of Chaohu Lake silt；the Chaohu Lake silt filling rate is 0.8-1.0 m3/h，the flocculant filling rate is 1.0-1.2 m3/h，and the curing agent filling rate is 0.08-0.10 m3/h. The test results show that the total phosphorus（TP）in the filtered water is significantly reduced，the dewatering and solidification treatment of silt will not cause extra pollution to the surrounding environment，and the use of geotechnical pipe bags for sludge dewatering is safe for environmental protection.