Due to the high cost of hosting, the Olympic Games have gone from being a "sweet pastry" to a "hot potato". To quantify the impact of the Olympic Games on the host country, the impact of the Olympic Games on the host country's economy, land use, satisfaction (athletes and spectators), travel, opportunities for future improvement, host city/country prestige, and environmental factors were considered in the selection of indicators, and the absolute and relative impact methods were used to classify these variables. In model building, the weights of the indicators were determined comprehensively by combining the subjective and objective methods of EWM-AHP to establish the Olympic Games Impact Metric (MOIM) measurement model. Finally, by constructing a functional relationship between the indicator variables and the degree of impact of the Olympic Games on the host country, TOPSIS analysis is applied to quantitatively measure the impact of the Olympic Games on the host country.