Abstract: Based on the government website and the city statistical yearbook, the economic development data of the cross-regional co-construction parks in Yangtze River Delta during 2015—2019 were collected, and the SBM model and Malmquist index were used to comprehensively measure the economy of the 23 co-construction parks in the Yangtze River Delta. The results showed that the co-construction parks with natural resources as the theme, especially those with high requirements for land resources and park size, because of the characteristics of low industrial level and single structure, tended to be at a disadvantage in the comparison and development of park economy, which were easy to be affected by external factors; the parks with high-tech industries as the theme, had low requirements for land resources and park size, and had strong economic development; there were obvious regional and time differences in the economic growth of co-construction parks in the Yangtze River Delta, and the comprehensive economic efficiency of co-construction parks in the secondary industry was higher, which was shown as Jiangsu Province > Anhui Province, Zhejiang Province; the input of comprehensive technology, especially the pure technical efficiency was the guarantee of the economic efficiency of the park, and the technological progress improved the production efficiency and development speed of the park. According to the current development situation of the co-construction park, some relevant suggestions were put forward, such as strengthening the land utilization standard, improving the land utilization rate, accelerating the multi-level industrial upgrading and improving the level of science and technology development.

Key words: cross-regional co-construction parks, measurement of economic comprehensive efficiency, SBM model, Malmquist index, Yangtze River Delta