A new beam profile diagnostics system for Shanghai Deep Ultraviolet Free Electron Laser(SDUV-FEL) has been developed based on industrial Ethernet

with good versatility and scalability.The system includes three major subsystems for image acquisition

pneumatic control and stepper motor control

respectively.Virtual instrument technology is adopted to drive the devices

and to develop the measurement software.In this paper

we describe the system structure

and its hardware and software design.The results of system commissioning are given as well.As an important diagnostic tool and data acquisition method

the system has been successfully applied to the measurement and control of the SDUV-FEL.