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The paper proposes novel dynamic distribution-aware data dissemination (DDA) based Publish/Subscribe system for Vehicular Ad Hoc Networks (VANETs). Based on the characteristics of vehicles' moving in VANET, a notification-token mechanism is proposed: only the notification-tokens' holder (notification-brokers) can broadcast information to subscribers nearby-based on the calculated delivery probability with interested subscribers and predicted dynamic distribution of those subscribers in this area, it can dynamically adjust notification-tokens in the VANET. Then the notification-brokers can broadcast the received notification to other subscribers accordingly. By dynamically adjusting notification-tokens, this solution can efficiently control notification-broker's distribution and guarantee data dissemination. Simulation results based on a real city map and realistic traffic situations show that the DDA based Publish/Subscribe system performs much better in terms of delivery efficiency and delivery delay over other solutions.