A method is proposed for measuring the internal clock stability and the adaptability of the environment temperature of taximeters(hereinafter referred to as meters) by using the highˉprecision UTC provided by the Beidou Positioning System as the reference clock source.The meters with three different crystals are used as the experimental objects, and the highˉprecision UTC time for the internal oscillator time was compared with the Beidou Positioning System.By changing the experiment temperature,the temperature effects on the meters’internal clocks were analyzed,and the meters’internal clock differences at 25℃ were recorded for 110 days.Through the analysis of the experimental data,the group of experimental results obtained can objectively reflect the long-term stability.?