中文摘要：

SaaS是一种通过互联网提供软件的应用模式，对于许多中小企业来说，SaaS是一种可以降低信息化成本的较好途径，它避免了企业硬件购买、平台搭建、基础设施和应用软件维护的投入。而SaaS的成功运作，关键在于正确定价模式的选择。基于SaaS服务的价格形成机制分别探讨了四种不同的定价模式：按需定价模式、基于成本的定价模式、基于价值的定价模式和面向竞争的定价模式，并讨论了不同定价策略在SaaS服务模式中的适用性。

英文摘要：

SaaS is the delivery mode of software online. It is an effective way to decreasing the cost of informati- zation for medium - sized and small enterprises. Adopting SaaS, the enterprises can avoid needless investment such as hardware purchasing fee, platform establishing fee, maintenance costs of infrastructure and software. But to SaaS , the right choice of pricing model is a key to success. This paper will discuss four kinds of pricing model;usage - based pricing, cost -based pricing, value -based pricing and competition -oriented pricing, and analysis the usa- bility of different pricing strategies.