In disaster scenarios where communication infrastructure is paralyzed,such as earthquakes,enabling efficient information dissemination through short-range communication among mobile devices becomes a critical challenge.Focusing on Bluetooth-based opportunistic contact communication in post-disaster urban environments,this paper takes the Direct Delivery algorithm as the primary research object,analyzes its limitations in terms of low delivery ratio and poor dissemination efficiency,and proposes an enhanced multi-hop dissemination scheme based on probabilistic forwarding and transmission control strategies.The results show that the proposed method significantly improves the delivery ratio and reduces transmission delay while maintaining low network overhead.Moreover, the message dissemination process exhibits an S-shaped growth pattern,which is more consistent with real-world spreading behavior.The proposed approach achieves a good balance between dissemination efficiency and resource consumption,providing an efficient and low-cost solution for emergency communication in infrastructure-less environments.