Objective To Design a medical information system to meet the requirements for informatized medical support by the field medical support institution. Methods J2EE architecture and Java technology were applied to the design of the system, and star topology was used for network deployment. Results The system shared casualty treatment data with servicemen electronic tag and medical commanding information with logistics integrated command and control platform,so that the requirements for medical information were met in the institution.Conclusion The system improves the field medical support institution in medical support ability,treatment rate and efficacy.