In order to solve the communication and storage problems caused by high-frequency data reporting in the electric energy data acquisition system, we first divide the redundancy of the remote communication datagrams into inter-frame redundancy, mode redundancy and coding redundancy through protocol analysis, and use datagram preprocessing method, LZ77 algorithm and Huffman algorithm to eliminate these redundancies respectively; Then, according to the problem which these redundancies cannot be removed by a single algorithm simultaneously, we analyze their characteristics and relationships and propose a combination compression method. Finally， the experimental results show that the method can effectively shorten the length of the datagram, thus reducing storage consumption and improving network transmission efficiency.