In order to eliminate the problem of frequent loss of thermal power units during the process of wind power generation, the introduction of carbon capture units and cascade hydropower is optimized. For wind-hydro-thermal power system containing wind power, cascade hydropower, conventional thermal power units, and carbon capture units, the multi-objective optimal operation model is built aiming at more efficient use of clean energy, ensuring the smooth operation of the traditional unit and reducing the comprehensive operation cost of the system. By using the principle of maximum membership, the proposed model is turned into single object optimization problem and solved by quadratic programming. Results of case simulation show that the adjustment role of hydropower based on accommodating all of wind power can reduce the adjustment of the thermal power unit, keep the thermal power unit running smoothly, and reduce the extra loss caused by the frequent adjustment of the thermal power unit. This work is supported by Science and Technology Development Program of Hunan Province (No. 2018GK4006).