China low activation martensitic(CLAM)steel,one of the three main reduced activation ferritic/martensitic steels(RAFMs)under development in the world,has been selected as the primary structural material of ITER testing blanket material(TBM)in China.It is important to understand the neutron irradiation effects of CLAM steel for nuclear engineering application,especially in an environment close to the service condition in future fusion energy systems.A series of neutron irradiation experiments of CLAM steel have been carried out in China and abroad to promote the application process of CLAM steel.In this presentation,current status of the study on the neutron irradiation damage of CLAM steel will be introduced,in which the results from the neutron irradiation data analysis for nuclear engineering application are included and discussed.Based on the understanding of the application requirements and current results,the R&D strategy of the study on the neutron irradiation damage of CLAM steel will also be proposed to contribute to its industrial applications in future nuclear energy systems.