An Open Architecture Computing Environment(OACE) for information countermeasure reconnaissance system is built including technical architecture, infrastructure, tasks assignment and middleware applications by consulting OACE of USA Navy in order to improve the commonality and reusable capability of information countermeasure reconnaissance system and the ability to adapt itself rapidly to multiple platforms and missions. OACE for information countermeasure reconnaissance system can separate software from hardware based on common computing infrastructure and separate reconnaissance applications from computing technologies based on middleware. The simulation results indicate that OACE for information countermeasure reconnaissance system is able to support plug and play for software and hardware and meets the requirements of rapid upgrading and easy expanding.