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Motion precision is a important evaluation index when design a 6DOF Platform .In order to reduce pose tracking error and boost synergy control, a multi-axis servo application based on EtherCAT is proposed on the basis of platform pose calculation of positive and negative resolving,and data is swiftly transmited by EtherCAT net. The hardware is mainly made up of IPC, EtherCAT, servomotor and Stewart platform. The software is developed by VC++ and TwinCAT,and ADS is used for communication.Electronic CAM is employed to achieve synchronous control between different axies. Experiment result show that the translational tracking error is less than 0.04 mm, turn tracking error is less than 0.01°, static tracking error is less than 0.1%. In a word, it can achieve the control requirements.A 6DOF platform based on EtherCAT has favourable synchron performance and pose precision.It also showed that EherCAT used in multi-axis synchron control has good response rate and control precision.