Abstract: Nowadays wireless vehicular network research has gained much attention and become an important topic. For such research, IEEE 802.11p/1609 standards have been proposed to provide V2I (vehicle to infrastructure) and V2V (vehicle to vehicle) communication. Using network simulations to conduct such research is more economic in time and equipments and safer than conducting field trials. However, traditional network simulators such as ns-2 only simulate computer networks without the ability to simulate roads, vehicle driving behavior (e.g., car following, lane changing), traffic lights, obstacles, etc. and thus are unsuitable for wireless vehicular network research. In this talk, I will present NCTUns network simulator for its extensions and usages in wireless vehicle network research. Several renowned international companies have been using NCTUns for their wireless vehicle network research, which include NEC and HITACHI Europe.