Absorbing boundary conditions （ABC） of total\|field using finite\|difference time\|domain method can be used in the computational of total\|field of electromagnetic

which is different from traditional ABC because it deals with the sum of incident and scattered waves of electromagnetic field

i.e. total\|field.It doesn’t have to divide the computing zone into incident and scattered field. The incident source is applied on the absorbing boundary directly. The connecting boundaries can be omitted. It’s easier to understand and program

and faster to calculate.In this paper

the equations of total\|field ABC be induecd.A 3\|dimension example is calculated and the results of tota\|field ABC are compared with those of scatteredzone ABC.