2.2. Lack of practical basis
A blue-green space is a measure of social environment, economy, and health and closely related to the happiness and satisfaction of urban residents. At present, many evaluation index systems of urban water body and green space have been developed as the basis for evaluating urban health and urban ecological civilization and have promoted the construction of blue-green spaces. In existing studies, water bodies and green spaces were separately evaluated without considering the coordinated planning and comprehensive urban ecosystems. In addition, without enough reliable and comprehensive indices, it is impossible to evaluate the spatial structure and ecological functions of blue-green spaces. In addition, water conservancy, greening, and landscape departments have different planning functions, so the separate construction of water body and green space have resulted in many problems. such as blue-green division. Natural hydrological conditions, land-water interlaced zones, or the connectivity of urban water-green corridors is not considered, thus affecting the integrated construction of urban blue-green spaces and severely limiting the quality of the constructed urban ecological environment. Therefore, it is particularly important to determine the appropriate evaluation indices and evaluation criteria based on previous studies and establish a scientific index system and an evaluation method to evaluate the degree of blue-green integration in urban planning.