Characteristics of 1-wire technique were introduced. A temperature survey system based on 1-wire digital sensor DS18B20 and PIC16F73 MCU was designed. The hardware structure and the software design were also described. Compared with the traditional temperature control devices, this system has simpler structure, higher precision and better anti-disturbance performance. In addition, each DS18B20 has a unique serial code, which allows many DS18B20s to function on the same 1-wire bus.