In order to reduce the deviation of equipment approval evaluation process by the human factors, designed a multilayer grey evaluation model, which combined analytic hierarchy process (AHP) with grey relation analysis (GRA). Hierarchy graph is designed by AHP, and relative weight of element in every layer is defined, then the degree of association between obtained indicator and target indicator is calculated by GRA, in order to make sure the level of equipment approval. This model solved the problem of evaluation index hard to quantify and statistics, improve the scientificity and accuracy of the evaluation, which provided a new method for equipment design and approval work.