Aiming at the problem of flocculation dehydration of Baiyangdian ecological dredging sediment by geotextile bags,we carry out the research and engineering verification of geotextile bags'dehydration experiments.Based on the small & medium-scale compound tests of inorganic flocculant,organic flocculant,and biological flocculant,we propose a flocculation scheme suitable for dewatering of Baiyangdian geotextile bags,and verify the dehydration performance of the flocculation scheme by the engineering implementation.We adopt the group test method,and take the floc size,floc strength,and supernatant clarity after flocculation of the sediment as evaluation indicators.The results show that when the dosage of compound flocculant is 1.5%,the flocculation effect of the sediment is the best,and the COD and TP of the residual water are significantly improved,with a reduction of COD and TP by 83.92% and 91.18% respectively.On the 30th day after the filling of the geotextile bags,the water content of the sediment was reduced to less than 55%.