Start and stop , power regulation of nuclear reactors depends on the control rod drive mechanism driv -ing control rod up and down movements .Accurate and reliable measurement of control rod position is an impor-tant guarantee for the safe operation of the reactor .In this paper , in the process of designing and constructing the rod position detector prototype of nuclear power station , the measuring principle , coding , coil number of choices , coil frame are described , the system is tested and the test results show that , the prototype design is reasonable and it has reliable performance .%核电站反应堆的启停、功率调节依靠控制棒驱动机构驱动控制棒上下运动来实现，控制棒位置的准确可靠测量是反应堆安全运行的重要保证。论文借助二代加核电站棒位探测器工程样机的研制，详细介绍了在棒位探测器设计过程中测量原理、编码方式、线圈数量的选择以及线圈骨架结构等内容，并通过各项性能测试与试验结果的分析，得出样机设计合理与性能可靠的结论。
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