Abstract: In order to improve martial and economic benefit of equipment，concept and method of multi-objective optimization are applied in designing and manufacturing.Based on the three models of time-quality time-cost cost-quality，setting cost and quality as main object，constructs a multi-objective optimization model，then calculates with NSGA-Ⅱ which is based on one kind of Pareto multi-objective Genetic Algorithms.It is applied to some detector design，MATLAB proves rationality of the model and validity of NSGA-Ⅱ algorithm.The result indicates that the convergence of NSGA-Ⅱalgorithm is better and the projects are abreast of the fact.The multi-objective optimization of design provides an efficient tool for military department to tradeoff time-cost-quality in decision-making.