【Objective】With the continuous promotion of park city construction, many urban development goals require synergistic planning of blue-green spaces to achieve, and it is particularly important to scientifically develop criteria for measuring blue-green spaces in order to promote synergistic planning of blue-green spaces. 【Method】This study adopts a dual-performance measurement approach, based on a GIS platform, and takes Putuo District in Shanghai City as an example. It selects four performance measurement factors, namely spatial accessibility, spatial use level, waterlogging diversion, and cold island effect, from two aspects: recreation services and environmental ecology, to scientifically analyze the rationality of the layout of urban blue-green spaces, and to derive typical areas of low performance in Putuo District in Shanghai and analyze their causes. The layout optimization strategies of urban blue-green spaces are proposed from three aspects. 【Result】The performance rating of blue-green spaces in the whole Putuo District is not high, and there are several obvious characteristics of the blue-green spaces in Putuo District based on the double performance assessment: (1) the number and distribution of community blue-green spaces are small; (2) the performance of recreation services differs greatly from north to south and is unevenly distributed; (3) the environmental and ecological performance shows a better characteristic in the north and south but less in the middle district; (4) the performance rating of the whole blue-green spaces is not high, and the lowest performance areas are roughly. The lowest-performing areas are located in the central and southern regions. 【Conclusion】Based on the above characteristics, optimization strategies are proposed from three aspects: the layout of urban water bodies, the layout of urban green spaces, and the coordinated layout of blue-green spaces. The research results show that the current spatial layout of the city's water bodies and the coordinated layout of blue-green spaces can be improved. The research results will provide practical criteria and solutions for improving the current spatial layout and planning future blue-green spaces.