Abstract: It is very important how to find the best service resources which meet to users' rectuirement and has high quality of service to construct networked software and improve users' quality of experience, according to diverse, indivictual and vague users’requirements of networked software. This paper proposed an on-demand service discovery method of networked software. First of all, according to specific domain, specific rectuirement instance and service resources were be marked by domain ontology. Then, a semantic matching model which consists of basic, function and QoS matching phase was built. This three phases gradually increase with predetermined-threshold judgment. Finally the best service resources which meet to users' requirement were found to construct networked software. Based on logistics field, the experiment was done for performance comparison testing, and the results indicated that this method can improve the matching precision of the requirement and service of networked software, and select the best service resources to construct networked software.

Key words: Networked software, On-demand service, Quality of service, Domain ontology