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Abstract In recent years, with computers in the social sphere infiltration SCM applications are constantly go deeper and Meanwhile promote traditional control method detection of ever updated. This paper describes the load weight is a sampling system of truck weights for the weight sampling. Circuit system used varistor constitute the Wheatstone bridge to collect small changes in voltage, After amplification circuit amplified into A / D converter circuit, the input voltage digital signal after the conversion output AT89S52 conducted by the control and data processing and results in the LCD display. This paper describes the design of the sampling system load is the weight of multi-functional intelligent control system son, for the whole system load of sample weight, but can also serve as an independent system for the detection of weight. Key words : pressure sensor wheatstone bridge analog-to-digital conversion technology MCU