For plate rolling mill, the influence of slab temperature, head end immersion at biting, use of AGC system, pressure sensor and broadening ratio on oversize in thickness of plate at head and tail ends is analyzed. 基于四辊中厚板轧机,分析了温度、头部沉入、AGC系统、压力传感器和展宽比对中厚板头尾厚度超差的影响。