White layers in hard ted surfaces were identified and measured as a function of ting parameters based on the Taguchi method. It reveals that white layers generate on the machine surface in the absence of tool flank wear, and white layer depth varies with the different combinations of hard ting parameters. Ting speed has the most important impact on white layer depth, feed rate follows, and cutting depth at last. The white layer generation consequently suggests a strong couple relation to the heat generation and thermal process of hard ting operation. White layer disappears under an optimal combination of ting parameters by Taguchi method. It suggests that a superior surface integrity without white layer is feasible under some selected combinations of ting parameters by a sharp CBN cutting tool.