VMDP is a visual model for distributed programming based on icons, which is used to illuminate the objects and the controls in a distributed system. With VMDP, a process is represented by a vehicle, a resource by a crossroad, and the coordination among processes by the traffic light. The coordination relations among processes and controls such as synchronization and mutual exclusion are understandable and readable in VMDP. VMDP devotes itself to building distributed system model, network programming, and parallel/distributed programming as well.