Abstract: In this paper, we study the projective synchronization in two coupled fractional order chaotic Chen systems. An approximate integer order system model for the fractional order Chen system is constructed. A wellknown state error feedback control method is utilized to control the scaling factor to a desired value. Mathematical analysis proofs the feasibility and the numerical simulation shows the effectiveness of the proposed method.

Keywords: 
• fractional order /
• chaotic system /
• projective synchronization /
• Chen system