Abstract: Due to the rapid network topology change of vehicular ad hoc networks (VANETs), the implementation of reliable data dissemination among vehicles has encountered many challenges. In this study, the Hierarchical Assisted-node-based Data Dissemination Scheme (HADD) of VANETs is presented. Since the vehicle mobility is limited to the road layout, the relative locations among vehicles are partially predictable. In our scheme, the location predictability among neighbor vehicles is taken into consideration to reduce the communication failure caused by the rapid change of the relative locations. Considering the drivers’ requirement degree for the data source information varies with different distances, the amount of data is customized according to the different requirements in order to reduce the channel conflict and increase the data dissemination efficiency. Simulation results show that the novel scheme can obviously improve the network performance of data dissemination rate and delay.