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In the development of large inertial X-Y ship model towing carriage, it not only needs reliable, real-time and high refresh frequency of data exchange between multiple controllers, but also needs upper control computer with powerful performance of PC and configuration communication programming function of PLC system. On the basis of comprehensive analysis of the mainstream communication network and control technology, this paper proposed an innovative and integrated design scheme, with WinAC as the control core , Profibus fieldbus as the communication network, PC plus RTX Real-time Kernel as Upper Computer, Visual Basic combined with third-party controls as man-machine interface development tools. Next, the hardware and software design processes are described, and the results of the system debugging are introduced. It provides good reference function for similar engineering equipment design.Experimental results show that the upper computer and the 10 lower computers can achieve reliable real-time data exchange of 2ms cycle. Based on this, the X-Y ship model towing carriage with a total weight of 110 tons can achieve the accuracy of position error less than ±2% and the angular error is less than ±0.5° when carrying the ship model to make circular motion of 6m in diameter and 1m/s in tangential velocity.