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In recent years, with the rapid development of the Ultra Wide Band (UWB) locating technique, UWB locating systems are widely applied industrial production control systems. Consequently, due to the covering range and scenes, it is necessary to divide the system into multiple positioning areas according to the actual engineering situation. Locating calculation is carried out in each area, and the area switching is proceeded afterwards to obtain the final result. If the area switching was handled improperly, it would affect the performance of the whole locating system and restrict its further promotion. Aiming at this problem, based on the UWB multi-area locating system, an area switching scheme is proposed and approved by practical engineering project. Test results illuminate the effectiveness, accuracy and instantaneity of the scheme (with location frequency as 5Hz, switch-in counting threshold as 2, and switch-out counting threshold as -2), which meets the engineering demands, and provides an effective method for regional positioning system design.