Based on the national conditions of China's economy changing from high-speed growth to high-quality development, the paper builds a country-specific high-quality development indicator system, and providehigh-quality economic development levels for 35 major countries from 2000 to 2017. The research results showthat: firstly, China's high-quality economic development level has significantly improved since 2000, the scoreof high-quality development has increased from 0.349 to 0.504, and its ranking has risen from 33 to 29 in 35countries. Secondly, China's economic strength has achieved leapfrog development, but there are still significantgaps between the other indicators, such as innovative development and open development. Thirdly, from aglobal perspective, the United States has the highest level of high-quality economic development, Germany andJapan also have high score of high-quality economic development level. The research results show that China'sinternational status as the largest developing country has not changed, and it is necessary to further strengthenthe relevant shortcomings to better promote high-quality economic development.