Abstract: Considering the problems associated with the traditional sample spinning frame,a CAD & CAM system for the sample spinning is developed through integrating technologies of information management,autocontrol,servo driving and variable speed control with frequency conversion.The CAD system,including design module of yarn structural parameters,spinning technique design module and report forms printing module,can design yarn structural parameters for both normal yarn and slubby yarn,spinning process and various parameters in every process.The CAM system,including carding frame,drawing frame and spinning frame,adopts digital control system based on PLC and multiple motors with individual driving technology.All the three machines are connected with host computer by RS485 communication bus,and each machine can run in either online or offline states.