在论述冷轧钢板表面三维微观形貌测量必要性的基础上 ,介绍了利用白光干涉特性进行测量的扫描白光干涉法的测量原理及测量系统 ,采用幅值解调算法确定测试点高度 ,既提高了测量精度又缩短了测量时间。由一个冷轧钢板测量实例 ,列出了经过平滑处理后的具有良好视觉效果的三维微观形貌图 Based on the necessity of measuring the three-dimensional micro-topography of cold-rolled steel, the measurement principle and measurement system of scanning white light interferometry using white light interference are introduced. The height of the test point is determined by the amplitude demodulation algorithm, The measurement accuracy and shorten the measurement time. A cold-rolled steel measurement example lists the smoothed three-dimensional micro-topography with good visual effects