Abstract: According to the problem that different conditions of traffic flow of different turns around crossings are neglected and uniform traffic conditions on a link is supposed on link dividing methods for traffic information collecting based on GPS equipped floating car at present,which leads to traffic data with low quality and poor effect of the road traffic conditions identification system and vehicle dynamic navigation system.The directional link dividing method can be used to collect traffic data distinguishing different turns around crossings and sub-link dividing method can be used to collect traffic data distinguishing different places of a link are designed,which improves application effect of the road traffic conditions identification systems and vehicle dynamic navigation systems.