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Man-machine interface of inverter controlling based on DSP was introduced. In terms of hardware, TMS320LF28035 DSP was a controller, which is based on its EVM entry plate for extended digital interface and display module; In terms of software, the timer interrupt managed the keyboard. As soon as hardware resources of DSP were saved, the man-machine interaction has been finished. Using serial parallel transformation chip, the circuit, which has been designed in the paper, can achieve the purpose of the general frequency converter for data input and output. Based on the above, the circuit established a foundation for frequency converter to achieve more control function. At the same time, the control pin numbers of DSP used in the human-computer interface are reduced, which enhanced the reliability of the circuit.