Hydrostatic transmission with secondary regulation based on constant pressure network (CPN) has the advantages of stepless speedless regulation, high power density, etc. This paper applies it to a Towbarless Tractor (TLT) transmission system and aims to improve its wheel control precision. A control strategy for TLT wheel coordination under driving condition is proposed and simulation is carried out in our facing-backward simulation model. The results show that good control performance can be realized by the control strategy. It can effectively achieve the goal of antislip. Moreover, the simulation analysis provides significant reference values for further development of wheel coordination controllers.