Abstract: As a source of social perception information in real time, social demand data plays an important role in emergency decision-making. Based on previous studies, an analytical framework composed of a data layer, a method layer, and a business layer is presented. Using the COVID-19 response practice in Chengdu in early 2020 as an example, the data value and value realization modes of social demand data in the application process of "scenario-response" emergency decision-making are investigated. It is found that social demand data is useful for crisis warning, decision support, and information communication in emergency decision-making. In order to to realize its data values, social demand data traverses the whole process of the "scenario-response" emergency decision-making through traction, activation and boosting. The application of social demand data promotes information fusion and utilization for emergency decision making, thereby improving the efficiency of emergency decision making.

Key words: Social demand data, Scenario-response, Emergency decision, Data value, COVID-19