According to the problem of the Human-machine Interface design from metal detector, human ma-chine interface display system of metal detector has been designed in this paper, which uses SPI communica-tion protocol as the core. Point of this paper is the study of the communication protocol SPI between metal lo-cator DSP and MCU. Hardware circuit and software design of the human machine interface system has been studied. In the existence of mineral, the system circuit is verified. The experiment indicates that the MCU can accurately read data which is sent from DSP by SPI protocol, meanwhile turns the data into Chinese characters thus displays them on the LCD screen when the DSP is running in high speed;besides, it is also proved that the system can not only detect percent of metal in the mineral, the accurateness and the anti-interference perfor-mance is also high, the result reach the expected goals.%针对金属探测器人机界面问题，设计了以SPI（串行外围设备接口）协议为核心的金属探测器人机界面显示系统。重点研究了金属探测器DSP和单片机之间的通信协议SPI，详细介绍了金属探测器人机界面显示系统的硬件电路和软件设计。本文针对矿石存在与否两种情况对设计的系统进行了实验验证。实验结果表明，在DSP高速运行时，单片机通过SPI协议能够准确地读取DSP发送的数据，同时在很短时间内将数据转换为中文信息显示在金属探测器人机界面。本文设计的系统不仅能够检测矿石中存在的金属，还具有较高的检测精度和抗干扰性。
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