For the Internet users who want to access the grid resources, the required resources should be found through the proper way of contacting grid infrastructures. Considering the spread of Internet access, the number of users who want grid resources is growing rapidly. Therefore, it is important for the grid resource discovery model to have the scalability characteristic for finding and accessing the resources. There have been many solutions for providing an efficient resource discovery model. However, most of these grid resource discovery models are not focused on the scalability issue when the goal is accessing the grid resources through the Internet. Considering the importance of scalability for accessing grid resources through the Internet, we have to address two separate problems in this thesis: 1- Providing the scalable solution 2- Examining the scalability of a proposed solution In this work a web service-based layered model that proposed a distributed search for resource discovery in grid computing is proposed and two architectures required for regional grid resource discovery in the proposed model are implemented.