The primary bolt and nut of reactor pressure vessel is an important component which is easy to be damaged and need to be inspected peri-odically.The sketch of control software for ultra-sonic inspection is introduced.This article from the software system logic structure,the scheme of leveling control,function and implementation of each module and other aspects are described,and control algorithm is also designed.It proves that the control software greatly facilitates the ultra-sonic inspection work for the primary bolt and nut during pre service and in service inspection.%核电站反应堆压力容器主螺栓螺母是重要的受力易损部件，必须对其进行定期的缺陷检测。介绍了自主研发的主螺栓螺母超声检测控制软件的构成，主要从软件的系统逻辑结构、水位控制实施方案，各模块的功能设计与实现等几个方面进行了阐述，并对控制算法进行了简单描述。事实证明，该控制软件极大方便了对反应堆压力容器主螺栓螺母的役前和在役超声检测工作。
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