But from the perspective of personal income, Hangzhou, Qingdao, Xiamen and Changsha are better choices. In terms of the number of innovative science and technology enterprises, Hangzhou has the most national high-tech enterprises and manufacturing single champion enterprises among the seven cities, and the seven Netroots cities, except Xiamen, are megacities with a resident population of more than 10 million people. in 2021, Xiamen had a resident population of 5.28 million people. Chongqing, a municipality directly under the central government, is also the most populous of the seven cities, with a resident population of 32.12 million in 2021. Chengdu is second only to Chongqing, with a resident population of 21.19 million in 2021. In the same year, Xi'an, Hangzhou, Qingdao, and Changsha had resident populations of 13.16 million, 12.2 million, 10.26 million, and 10.24 million, respectively. The average annual salary of the general labor force in the city is higher? For the last three consecutive years, it's Hangzhou, reaching 146,701 yuan in 2021. It is followed by Qingdao, Xiamen, Changsha, Chengdu, Xi'an and Chongqing. Of the seven online cities, Xiamen is the hardest city to buy a home in and Changsha is the easiest. While Qingdao is expensive to buy a home, rental prices are low. Chongqing is the city with the most abundant basic education schools, while Hangzhou and Xiamen have relatively fewer basic education schools. Chongqing is the city with the highest number of beds in medical institutions, followed by Chengdu, Hangzhou, Chongqing, Qingdao, Xi'an and Xiamen. In terms of green space (municipal districts), Chongqing is also the city with the most green space, reaching 707 square kilometers in 2020. It is followed by Hangzhou, Chengdu, Qingdao, Xi'an, Xiamen and Changsha.