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Water quality parameters monitoring in the traditional aquaculture process has the disadvantages of poor real-time performance and poor measurement accuracy. To solve the problems, an aquaculture environmental monitoring system based on wireless sensor network(WSN) is designed. ZigBee wireless communication technology is used to build a sensor network with hybrid topology. Through the design of hardware and software, this system implements the real-time monitoring of water quality parameters, such as dissolved oxygen, pH and water temperature. Water quality parameters are collected to central node, then sent to the main controller, and uploaded to the cloud by GPRS. Furthermore, homomorphic encryption is applied in cloud database to protects users" privacy without disrupting the ability of cloud computing.