Three typical kinds of dredged silts from Taihu Lake, namely HH-4, HH-10, LM-2, were stabilized by a series of cementatory soil stabilizer with adjustable ingredients. Experiments were conducted to confirm the feasibility of using the stabilized-soil as roadbase filling, and determine the content of main ingredients and optimum mixing ratio of the stabilizer and engineering properties of the stabilized-soils. Results show that the stabilized-soil can be used as roadbase filling while the mixing ratio is above 6%, but as for HH-10, the A, D, F ingredients of the stabilizer should be increased. Because of the grain size and oxides content of the soils, HH-4 stabilized-soil has a higher short-term strength and LM-2 stabilized-soil has a higher long-term strength. Application of the stabilized-silts to roadbase construction can not only prevent pollution from the dredged silts, but also save land resources, thus brings enormous benefits to the economy and society.