To solve the defect in IEEE 802.11p standard that coherence bandwidth is insufficient to estimate the channel state in rich scattering environment, hance a time domain channel estimation technique is proposed in this paper. This technique is based on least-square (LS) algorithm, and assisted by Zadoff-Chu sequence in symbol prefix and preamble. The channel models in the simulation are referencing HIPERLAN/2. Keywords-IEEE 802.11p, DSRC, channel estimation, least square algorithm IEEE 802.11p, DSRC, channel estimation, least square algorithm