We study the the spatial development of the kink instability along helically magnetized rotating, relativistic jets using special relativistic MHD code “RAISHIN”. Using non-periodic computational box, the spatial growth of the kink instability is triggered by a precessional perturbation at the inlet. Currently we are studying light as well as heavy jets depending on density profile besides different set of angular velocity amplitude parameters are also provided. The jets do appear to be collimated by magnetic field lines and the magnetic acceleration is also seen due to conversion of electromagnetic energy into kinetic energy of the jet. We also briefly discuss the role of magnetic reconnection at the location of kink instability along the jet.