Abstract: This paper use Cubic Spline as temporal basis function to effect the temporal discretization of the time-domain electric field integral equation(TD-EFIE),Because the temporal basis functions are noncausal,the one step extrapolation method is used to construct a marching on in time(MOT) scheme to solve the problem on transient scattering and radiation from straight thin-wire.Using the Cubic Spline as temporal basis functions has most desirable attributes such as short temporal support,accurate interpolation and simplicity. Numerical results show that this new temporal basis function provides a much more accurate and stable MOT solution.