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In order to solve the problem that high voltage, high current and strong magnetic field effect to the power data acquisition system for the high voltage platform of the neutral beam injection, the new data acquisition system is designed based on the cRIO platform through the NI Linux Real-Time system runs in the CompactRIO controller, the LABVEIW graphical development tool, the mixed acquisition mode of the user I/O and the node I/O programming in FPGA. The data acquisition system realizes the demand for the mixed measurement of the signal of the filament power and the arc current with different acquisition frequencies in the high voltage power supplies of the second line of the neutral beam injection system. The test in HL-2A discharge experiment shows that the acquisition system is stable and reliable, anti-interference performance is strong, the upper computer interface operation is flexible, and maintenance is convenient.