As a key technology for low carbon transformation of power system, carbon capture technology applied to combined heat and power system can reduce carbon emissions of virtual power plants. To this end, a technical route that applies carbon capture technology to the combined heat and power optimization of virtual power plants is proposed to promote their low carbon economic operation. On the one hand, it relies on the ladder carbon trading mechanism, demand response and power-heat interconversion to reduce the carbon emissions of combined heat and power operation of the virtual power plant; On the other hand, it aims to minimize the operating cost of the virtual power plant, taking into account the internal constraints of the virtual power plant such as load regulation potential and the upper limit of new energy output, as well as the physical constraints of power-heat-carbon interconversion to improve the operating economy of the virtual power plant. Based on the actual operating data of a park, a control scenario is designed around whether to configure carbon capture technology and demand response, and the proposed virtual power plant combined heat and power optimization model is verified to have certain realistic availability and robustness.