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E-learning communication security should be considered to ensure sensitive message transmission. Authenticated key agreement protocol in the client- server setting is the fundamental building block for ensuring client-server entity authentication, data confidentiality and integrity. So far, great deals of two- party authenticated key agreement protocols were proposed based on traditional public key cryptography and identity-based cryptography, but the certificateless-based authenticated key agreement protocol is seldom discussed. In this paper, we propose such a secure protocol from a certificateless public key encryption scheme due to Park et al. Compared to other comparable protocols, it achieves more security attributes, such as no-key escrow, perfect forward secrecy, known session-specific temporary information security and no-key control etc. Meanwhile, it keeps nice efficiency.