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A method of the remote upgrade proposed in this paper because of the problem of software upgrades and maintenance difficulty in wireless network optimization monitoring system base on the Flash memory of LPC2138. And details of hardware and software realization are proposed in this paper. It not only supports the function of software upgrades and resuming broken downloads, but also supports the function of switching software versions in old and new. Experiments show the validity of this method and the applicability for practical projects.