In order to realize the evaluation of rise time measurement of digital oscilloscopes, according to the method of Verification regulation for digital oscilloscope, the rise time of oscilloscopes is measured. In this paper, the uncertainty sources of measurement result is analyzed. Using Tektronix’s TDS3032C digital oscilloscopes as an example, the paper introduces the measurement result uncertainty evaluation process of the rise time of digital oscilloscopes, and given the evaluation results. Practice proves that the method is logical and effective, which can be referenced for writing oscilloscope verification device standard report and evaluation of rise time of oscilloscopes.