In this paper , by using the principles of systems science and similarity engineering , the integration design method of mechanical product systems based on similarity unit substitution is established . the objective is to solve the problem of design by reuse in cad process , supporting modification design and creation design 本课题运用系统科学及相似工程学的原理，建立基于相似单元置换的机械产品系统集成设计方法，目的在于解决机械产品cad设计中的设计重用问题，支持变型设计及创新设计。
In this paper the definition of the tourism product is explained . the tourism product has comprehensiveness , culture , information , variety and commodity as its distinguishing features . without considering uncontrollable factors , the systematic development of the tourism product may be influenced deeply by tourist resources , spatial competition , the possibility of entering , developers , tourists , operators , regional economy , natural and social environment , etc . in addition , this paper still puts forward the structural optimization and the innovational development combining the development traits of regional tourist products 旅游产品是旅游经济学的重要概念和核心内容，但目前对其基础理论的研究还没有引起旅游学界高度重视，本文从不同角度阐释旅游产品的定义，认为其本质特征有综合性、文化性、信息性、多样性、商品性；并以系统论和可持续发展理论为基础构建区域旅游产品系统开发理论；在不考虑不可控因素的前提下，对旅游产品系统开发有着较为深刻影响的因素主要有旅游资源、空间竞争、可进入性、开发者、旅游者、经营者、区域经济、自然和社会环境等。
After the weightiness of product attributes being researched , a new method is established to calculate the weight of attributes . the method is applied in weighted distance coefficient and system similarity to measure similarity degree . it enhances the objectivity and accuracy of the similarity measures 探讨了在相似度量中机械产品系统特征属性的重要性问题，提出一种新的权重值确定方法，在此基础上建立加权距离系数法，并研究了系统相似度量方法，提高了相似度量的客观性与准确性。
