中文摘要：

目的为了提高产品的易用性，提出了一种合理有效的改良设计方法。方法运用系统分析法将原产品分解成各个子系统，以便通过用户研究进行产品的改良点定位，在此基础上提出多样的改良设计备选方案，并使用多层次分析法进行备选方案的权重比较，从而找到最优的改良设计方案。结论这种改良设计方法不仅能快速抓住产品的重点部位进行改良，还可以有效地平衡各方面的用户需求，使改良后的产品更加易用。

英文摘要：

Objective In order to maintain competitiveness, a rational and effective improved design method is put forward. Methods Under the cognitive basis of the product basic shape, the system analysis method is used to decompose the original products, and the user research results are helping to determine the sites that need improved, then the purpose is to let more problems exposed from the complex system and screen out the key problems, and then give the possible solutions. In order to make the chosen scheme is optimal over the overall, AHP is needed to use to get the best integration. Conclusion This method can quickly improve the important parts, and effectively balance the use needs, and make the improved products competitiveness.