Abstract: The structure and the function of the reactor internals of the improved generation II PWR power plant is instructed briefly,the critical factors and difficulties in the manufacture process for reactor internals are analyzed,the quality control and surveillance of reactor internals manufacturing is discussed,especially the critical factors and difficulties of the quality control in the manufacture process for the main parts of reactor internals and in the reactor internals assembling process are represented in detail,the key points of the resident manufacture supervision is presented,and other key points of quality control in the manufacture process are also given,such as the documents control and personnel control.