Abstract: Aim Away was explored to evaluate and analyse the multiobject results of the orthogoral experimental design.Methods We designed the related factors which possibly influence the property of temperature of the hot ting-bag in L₈(2⁷)and made a grey evaluation based on the results of the experiment, subsequently we selected out a best recipe.Results The selected recipe could make the highest temperature of the hot ting-bag get to 58.6±0.6 ℃ and maintain the temperature for 12.1±0.4h.The time of getting to the temperature was 7±2 min.The recipe was perfectly fit for the body.Conclusion Grey evaluation can turn the multi-object problem to a simple-object one, and it is possible to employ the grey evaluation in the analysis of the results of orthog onal experimental design.

Key words: ho t ting-bag, grey evaluation, orthogonal experimental design