To deal with the real-time technology in developing a multi-axis EDM-CNC system,RT -Linux was adopted.Based on RT-Linux,the system was macroscopically divided into a time-sharing part and a real-time part,and microcosmically into user management module,real-time control module and driving module.All the real-time parts of the three modules were constructed,including the construction of real-time control module,driving module,the communication between user management module and real-time control module,and the communication between real-time control module and driving module.A five-axis EDM-CNC system is developed and then applied to the machining experiment of rimed turbine blisk.It is concluded that the system is real-time,stable and efficient.