Abstract: Urban-rural integrated development constitutes an important institutional arrangement for constructing a new type of urban-rural relationship and advancing common prosperity in the new era. Drawing on the current state of urban-rural integrated development in Henan Province, the study constructs a synergistic symbiosis theoretical model and indicator system based on symbiosis theory and synergistic governance theory, and adopts the fuzzy-set Qualitative Comparative Analysis (fsQCA) and Necessary Condition Analysis (NCA) to explore the necessary conditions and configuration paths which urban-rural integrated development promotes the common prosperity. The findings reveal that the regional industrial level is a crucial condition for urban-rural integrated development to promote common prosperity. Four types of paths play significant roles in this process, namely, the "integrated environment" promoting type, the "urban-rural complementarity" developing type, the "industrial and agricultural mutual promotion" optimizing type, and the "economic development" supporting type. The urban-rural integration environment, main bodies and processes interact with each other, generating synergistic effects towards achieving the goal of common prosperity. Localities should base themselves on actual conditions, leverage strengths to complement weaknesses, and create distinctive practical models of urban-rural integrated development for common prosperity with local characteristics.