Abstract: The Pseudospectral time-domain (PSTD) algorithm can be used to solve the scatte ring of the electrically large objects. To introduce an incident fields into the PSTD computed region, a weighted-total-fields technique is presented in this pa per. Similar to the FDTD method, the PSTD computed region is divided into the to tal-filed zone, scattering-field zone and connection zone. A scalar weighting f unction is employed to let the incident field varying from 0 to 1 in the 8-10- layer connecting region. It is much easier for the PSTD to simulate scattering o f complex objects by using the weighted-total-fields technique than applying t he pure scattered-fields scheme. The validity of the presented method is proven from numerical results of scattering width of two objects illuminated by a Gaus s pulse, respectively.