Abstract: With the establishment of China's carbon emission trading market，the self-owned power stations of refinery and petrochemical enterprises are included as key emission units，and the allocation method of carbon quota is calculated by the benchmark method. As the requirements of refineries demand for steam and power produced by the self-owned power stations need to meet firstly，it is necessary to adjust their operation regularly，which has an important impact on the carbon emission performance of the self-owned power stations. In this paper，the steam-electric conversion model of steam turbine was established to predict the operation data with different heating extraction capacity. Based on this data，the influence of heating extraction on carbon emission，emission allowance and the allowance gap were studied. Based on the production data of a petrochemical enterprise，the influence of constant inlet adjust mode and constant condensation adjust mode on the quota was analyzed. When the heat supply increased from 1.792×103 TJ to 2.875×103 TJ，the total quota increased from 376.76 kt to 434.68 kt under constant intake mode，and the total quota increased from 355.98 kt to 502.76 kt under constant condensation mode. It is of great significance to guide the production and operation of enterprises.

Key words: carbon emission trading market, cogeneration of heat and power, carbon allowance allocation, heat supply ratio