The construction and effective application of net based educational resources are of great importance for e-learning. SOA (service oriented architecture) enables the reuse and share of net based educational resources by publishing the resources as web services. However, frequent identity authentications in resources access among different providers take up overfull system resources and lower the implementation efficiency. We propose a unified access control model (UACM) based on SAML and security access control technology. UACM meets the requirement of effective access to educational resources and reduces the cost of construction.