Abstract: To address the challenges of limited communication capacity and low transmission reliability in Beidou short message services for power intelligent terminals, this paper proposes a novel approach that integrates differentiated coding with adaptive transmission mechanisms. The proposed method classifies power-related data based on their intrinsic characteristics and assigns differentiated priorities through customized encoding schemes. A dedicated compression algorithm is developed to increase information density, while an adaptive spectrum spreading anti-jamming protocol, coupled with a multi-level acknowledgment mechanism, is designed to enhance communication robustness. Field experiments conducted in remote substation environments demonstrate that the proposed scheme improves information throughput by 42.3%, reduces transmission latency by 38.5%, enhances anti-jamming performance by 53.7%, and achieves a transmission success rate of 96.8%. These results validate the feasibility and effectiveness of the proposed technique as a new solution for reliable and efficient Beidou short message communication in smart power terminals.