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To solve the problems in traditional monitoring system including wiring problems, covering narrow, node’s immobility and so on. A remote wireless monitoring system based on ZigBee/3G is designed. The whole system is composed of ZigBee wireless sensor network, 3G-ZigBee gateway’s node, 3G network and monitor’s center. The nodes in wireless sensor networks are composed of RF module, the mainboard, sensor module and power supply module. The RF module is composed of the length distance combination CC2530 and CC2591. The connection between ZigBee network and 3G is implemented by 3G-ZigBee gateway’s node which is developed with the microprocessor S3C2440 of ARM9 and Linux operation system. This system is used in water quality monitoring system in the aquarium. Temperature, pH, conductivity, dissolved oxygen, ammonia nitrogen and other parameters are measured. The results show that the system has achieved the more stable acquisition speed and the higher transmission speed. And the system satisfied the requirements of the modern monitoring system.