光盘反光面的彩色条纹为人们所熟知，可背后的物理原理却鲜有人挖掘. 本文从生活中观察到的现象出发，设计实验对光盘背后彩色线条纹特征进行了系统研究，发现了与传统经验规律不同的条纹弯曲现象，创造性的提出了光程差场理论,并结合光盘特有的结构特征予以解释，通过MATLAB仿真与实验结合进行了定量验证. 最后从对称性角度丰富了传统光栅的概念，深化了光栅衍射经验规律的物理内涵，为光栅衍射分光效应研究提供了一种新的思路，并丰富了教学内容.

The colorful lines on the back of disc are well known, but the physics behind them are rarely explored. Starting from the special phenomena observed in daily life, in this paper experiments are designed to systematically study the characteristics of color lines and stripes behind disc and to find out the fringe bending phenomenon that is different from the traditional empirical law. Creatively, the theory of OPDfield is proposed to explain it in combination with the unique structural characteristics of disc. Then it is verified quantitatively by Matlab simulation and experiment. Finally, the concept of traditional grating is enriched from the symmetry point of view and the physical connotation behind the empirical law of grating diffraction is revealed, which provides a new way to study the spectral effect of grating diffraction and enriches the teaching content．