With regard to the slipping phenomenon of top step shims in finishing mill during rolls changing, some mechanical structures of the finishing mill are upgrade and its control pro-gram is modified and so the phenomenon of the breakdown in rolls changing is in effective control. And what's more rolls changing time is shorted form 50 minutes to 20 minutes and the productivity is improved.%针对精轧机上阶梯垫在换辊中的跑位现象，通过对机械结构改进与控制程序修改完善，有效控制了故障现象的发生，换辊时间从50 min减少到20 min，提高了生产效率。
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