Urban ecosystem services refer to the benefits that mankind obtains from urban ecosystems. Urban green space is the main carrier for providing urban ecosystem services. The acceleration of the urbanization process poses a threat to the stock of urban green space. It is difficult for urban ecosystem services to meet the residents demand. The traditional urban green space evaluation indicators mainly evaluate the urban green space area. Those indicators are always integrated and two-dimensional, ignoring the three-dimensional green quantity and the quality of ecosystem services. Based on the above background, this paper proposes an evaluation indicator of urban ecosystem service function-urban ecological comfort index, which makes quality feedback on the urban ecosystem service function through the subjective feelings of the human body. Combined with the grey correlation analysis method, the evaluation model of the index is constructed. Through the comparative analysis of the conditions of the samples, it is concluded that when the green view index is lower than 30%, the main influencing factor of urban ecological comfort index is green view index; when the green view index is higher than 30%, the main influencing factors are humidity, PM_2.5 concentration, and wind power level. Comparing the simulation results of the evaluation model with the measured values, the results show that the change trends of two sets of data are basically the same, indicating that the evaluation model is scientific and effective.