Abstract: With the development of wireless communication 5G/6G technology, a variety of new services based on the fusion of communications and radar (RadCom) technology continue to emerge. In order to implement RadCom based on 5G new radio (NR), many different deployment scenarios covered by the latest 5G NR wireless communication standard defined by 3GPP need to be considered. However, radar detection performance is limited by 5G NR numerology in different scenarios. Therefore, it is necessary to explore the radar detection performance with different 5G NR numerology in specific scenes. This paper takes the radar detection requirements of internet of vehicle (IoV) scenes and the calculation criteria of basic radar performance parameters as constraints, and presents the simulation analysis of radar detection performance under different 5G NR numerology. Some instructive suggestions are given for the designs and optimizations of RadCom systems based on 5G NR standard and deployment scenarios in the future.