Abstract: The residual transition-metal catalyst in atom transfer radical polymerization (ATRP) system may cause process and environment issues，that will restrict its commercialization. In this paper，several immobilized catalyst systems，including silica or quartz，cross-linked polystyrene or other polymers used as the immobilized catalysts of ATRP are summarized. They can solve part of the residual catalyst problem，but these approaches have some limitations. An immobilized/soluble hybrid ATRP system was developed to overcome this difficulty，and no noticeable differences between hybrid and conventional homogeneous catalyst were observed. This result indicates that immobilized/soluble hybrid catalyst system can be applicable to various ATRP systems.