Calculation of the HCLPF value of structure,system and component(SSC) in nuclear power plants(NPPs) is an important process for seismic probability safety assessment(SPSA) and seismic margin assessment(SMA).In this paper,three methods for calculation of the HCLPF value of SSC are presented,such as fragility analysis,conservative deterministic failure margin(CDFM),and HCLPF value based on test.The recent progresses in calculation of the HCLPF value of SSC are investigated.Finally some suggestions for the calculation of the HCLPF value of SSC are proposed.