Abstract: In view of feature that temperature of motor could increase in abnormal condition, the paper proposed a design scheme of temperature monitoring system of motor based on 1-wire bus. Taking motor of fuming furnace of some company as an example, it introduced hardware structure and design of upper computer software of the system in details and gave problems needed pay attention to in process of installation and debugging of the system. The actual application showed that the system has high measuring precision and meets engineering requirements.