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Traditional thermal resistance temperature measurement method is not conductive to the integration of pico-satellite due to its complexity and large number of cables, as the number of pico-satellite functions increases and the integration enhances. In this paper, a method of measuring temperature based on 1-wire is introduced; the 1-wire technique and its features are presented aiming at the characteristics of space applications. Through experiments, the space environmental adaptability of DS18B20 is analyzed, and the conclusion is drawn. The design concept of the application using 1-wire technique in satellite is given. In view of the high reliability requirement characteristic of satellite, this paper introduces the hardware and software fault processing method. Finally, the method is validated on orbit. The technique, which can reduce the satellite temperature cable weight and improve the integration of the pico-satellite, has the prospect of popularization and application.