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Based on the orthogonal experiments, using micro-diameter tool milling thin-walled parts of hardened steel in high-speed to research the effects of different cutting parameters on the radial cutting force, vibration, and surface roughness which optimize the cutting parameters. Firstly it make the researching goals into a stability characteristic of product quality named SN ratio, then using principal component analysis make the multi-objective quality characteristics into a single objective quality characteristics combined with analysis of variance to optimize the cutting parameters which not only analyze the significant impacts of cutting parameters on comprehensive quality but also obtained more reasonable cutting parameters and it can be a certain guiding significance for milling thin-walled parts of hardened steel with high speed. KEYWORD: hardened steel; thin-walled work piece; Optimization