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Purpose: This study investigated the effect of the frequency of summary feedback on proprioception during knee extension in healthy subjects. Methods: Forty-eight young adults volunteered to participate and were randomly assigned to one of four groups (1*summary, 5*summary, 10*summary, and control). The power and velocity errors for proprioception in knee extension were measured using a PRIMUS RS system (BTE Tech., Hanover, USA). Multivariate analysis of variance (MANOVA) was used to determine the effect of the frequency of summary feedback on proprioception in knee extension of healthy participants. Scheffe post hoc tests were applied, and the level of significance was set at α=0.05. Results: In the acquisition phase to practice the effect, power, and velocity error scores in all summary groups were significantly lower than those in the control group (p<0.05) but did not differ significantly between the summary groups (p>0.05). In the retention phase to assess the learning effect, the power and velocity error scores in all summary groups were also significantly lower than those in the control group (p <0.05), and the score in the 5*summary group was significantly lower than those in the other summary groups (p<0.05). Conclusion: 5*summary feedback was effective for motor learning while reducing the error of proprioception.