Abstract: In the course of collection and edition,the data model,the collecting method and the quantity control means of 3D data are much more complicated compared with 2D data.A compatible 3D data model of cloverleafjunction is very important for collecting data of cloverleafjunction of city.Because of affiliating 3D information,catching between data is no longer a simple complete consistence among coordinates of nodes,but is divided into the 2D catching for plane coordinate(x,y) consistence and the 3D catching for stereoscopic coordinate(x,y,z) complete consistence.For practical application of navigation of vehicle,the given data model of cloverleafjunction in this paper is preferably capable of expression of cloverleafjunction of city.The practice of data production on a large scale indicates that the data model is feasible to collect data of cloverleafjunction.