The treatment of cyanobacterial dewatering and reduction has become a new issues in lakesimprovement. The essence of dewatering of cyanobacterial is a process of consolidation and drainage; therefore, the investigation of the consolidation behavior of cyanobacterial byconsolidation experiment is important to the enhancement of dewatering effects. Based on the improvement of oedometer by setting additional piezometer and displacement sensor, one type of cyanobacterial and one type of dredged materials were studied for their difference of consolidation characteristics. The results indicated that consolidated time of cyanobacterial was very long and the excess pore water pressure dissipated very slowly. The coefficient of consolidationand coefficient of permeability of cyanobacterial is extremely low,and have great changed in the consolidation process.Meanwhile,the main reason of long time consolidating and extremelyslow for drainage is a large number of organic matter cells in cyanobacterial.