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Grid security is a key component in Grid computing. The mainstream Grid security solution, Grid Security Infrastructure (GSI) for Globus Toolkit (GT), offers comprehensive security services. This is achieved by applying public-key cryptography, cryptographic protocols methodologies and the necessary infrastructural supporting services in which public-key authentication framework (PKI) is the main component. Although an important development from the provisions of security services for distributed computing, it is considered that there is much room for further strengthening GSI in the direction that Grid security can make a clear distinction from distributed computing security. A desired distinction would be that security services for Grid security should manifest and facilitate the Grid feature of advanced resource sharing. In our work, we developed a system called Security Proxy based Tusted Computing (SPTC) modular to enhaced the grid security.