en 3-Nonlinear Control Systems Nonlinear Control Systems Research Paper Research Paper This paper focuses on the tracking and synchronization problems of hyperchaotic systems based on active backstepping method. The method consists of a recursive approach that interlaces the choice of a Lyapunov function with the design of feedback control. First, a nonlinear recursive active backstepping control vector is designed to track any desired trajectory in hyperchaotic Wang system. Furthermore, this method is applied to achieve hyperchaos synchronization of two identical hyperchaotic Wang systems. Also, it is used to implement global asymptotic synchronization between hyperchaotic Wang system and hyperchaotic Rössler system. Numerical simulations have been employed to verify the effectiveness of the three designed active backstepping control vectors. Hyperchaotic System,Identical Synchronization,Backstepping Methods,Rössler and Wang Systems, 217 226 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-688-1&slc_lang=en&sid=1 A. Abooee aliabooee@elec.iust.ac.ir 180031947532846001979 180031947532846001979 No Electrical Engineering Department, Iran University of Science and Technology, Tehran 16846-13114, Iran. M. R. Jahed Motlagh jahedmr@ iust.ac.ir 180031947532846001980 180031947532846001980 Yes Electrical Engineering Department, Iran University of Science and Technology, Tehran 16846-13114, Iran.