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In the conventional asset management systems, users cannot customize services sets flexibly because of certain fixed mode in the systems. Another problem is that, the systems which integrate RFID technology to monitor the assets have to be redeployed when the RFID equipments are replaced. In this paper, we propose an open mobile asset management system based on OSGi to solve these problems. On the OSGi service platform, the services are encapsulated into bundles, which can be installed, updated and removed without disrupting the operation of the system, so that the replacement of the RFID equipments is more flexible. Meanwhile, using the OSGi enables the users to define function modules suitable for them, which enhances the openness of the system.