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This paper discusses the two main approaches to the design of data packet for embedded system:Data encoding and Data transmission Separately.The latter is preferred for the particular needs of an embedded system.Then a methodology and a design flow for data packet design is presented.The approach relies on the exploitation of the features of the applications of Mobile communication technology and short messages data transmission technology.Also a further optimization is given to the data-sending technology;the author made a test based on these technologies,and achieved the desired results.