Abstract: The paper introduced characteristics and working principle of a 1-wire bus digital temperature sensor DS18B20,discussed communication scheduling of 1-wire bus protocol in details.In the basis of the(discussion,) it also put forward a design scheme of temperature measurement system based on DSP processor TMS320F2812 and DS18B20,and gave implementation methods of software and hardware of the system.The temperature measurement system can measure 8-channel temperature at the same time.When the temperature is overrun,the system can alarm in time.The practical application showed that the system works with stability and reliability,and has (certain) practicability and value of popularization.