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Wireless sensor networks are booming today. However the usual wireless sensor networks based on MCU are not suitable to measure fast dynamic signals. In this paper, the wireless sensor network provides a novel measurement for dynamic field systems. We designed an intelligent wireless field measurement system (WFMS) based on wireless sensor networks, which can be applied to measure the fast dynamic field signals. Changeable sampling rate is proposed according to the specific application background in the system. CPLD is used as the main controller for the high and changeable sampling rate and MCU cooperated with a transceiver for the communication of node. The most important significance of this design is that a ldquofirst-saving-then-transmission-mechanismrdquo (FSTTM) and a ldquowaiting-actionrdquo mechanism is built up, which based on the limited hardware resource in wireless sensor network. These mechanisms deal well with the relation of the system performance and limited resource. The experiments indicate that the system works well and its design is successful based on multi-hop network. The complicated system with intelligence can measure a field signal at changeable sampling rate reliably and accurately.