Secure simple pairing has been adopted by Bluetooth version “Bluetooth 2.1+EDR(ENHANCED DATA RATE).It should be noted that for establishing Bluetooth connection that uses Diffie hellman public cryptography in its communication, SSP is a secure method. But it is still prone to attack regardless of the high security mechanism it provides,for example man in middle attack. In this paper we provide a efficient method to prevent man in the middle attack.