In this paper, we propose a distributed hybrid database system. Firstly, the dissemination server copies entity tables in relational database to the local memory database and the dissemination clients load complete snapshot from server's memory. Then, the client and server will keep synchronization through dissemination mechanism after initialization. In this paper, we present the design of data classification and data storage. Especially, we introduce the design porocess of dissemination mechanism, mainly involving dissemination module, polling mode, Delta id usage, dissemination recovery protocol, DB record synchronization.