In this paper, we propose a scheme allow vehicles in a Vehicular Ad hoc Network share running information among them. We developed a mechanism that can help a vehicle to judge the trustworthiness of a message. We classify information into two types: one is emergency warning message, and the other is event reporting message. By collecting reports from other vehicles who pass through the place where an event occurs on claimed by a message, a vehicle can make a decision whether the message is true or false by using algorithms proposed in the paper. Simulation experiments show the scheme can work well and efficiently. The scheme can resist certain attacks that are hardly identified by other schemes as it avoids using vehicle’s ID. It can also protect a driver’s privacy in some extent which is a hot issue in recent research.