To aim at the difficulty of the implementaion in computers for finite-difference time-domain (FDTD) algorithm

the concepts of time and space fault-tolerance are presented here.Furthermore

the fault-tolerance characteristic of FDTD algorithm is analyzed in detail

and some key factors are discussed which influence the running performance and computation precision in the fault-tolerant FDTD algorithm.With the implementaion of the fault-tolerance

the perfectly matched layer (PML) absorbing boundary is ignored

and the data arrays of electromagnetic field are gained by using memory-mapped technique

which is applied to time and space fault-tolerance for FDTD algorithm successfully.The computed examples are given

and various comparisons are made to prove the feasibility of this approach.The results show that the proposed method is effective.