This study aimed to investigate the effects of stair-walking training with knowledge of performance (KP) on balance and walking function in patients with stroke. The study utilized a single-subject experimental research design (A-B-A’). A patient with subacute stroke participated in the study. Experimental process consisted of comprised three phases (totaling 20 sessions): (1) baseline phase (5 sessions), (2) intervention phase (10 sessions), and (3) withdrawal phase (5 sessions). The outcome measures included the one-leg standing test (OLST), sit-to-stand test (STS), Berg balance scale (BBS), and 10-meter walk test (10MWT). During the intervention phase, stair-walking training with KP, focusing on head and trunk postures as well as lower limb motion, was applied for 30 minutes. However, this training was not implemented during the baseline and withdrawal phases. The results showed significant improvements in OLST, STS, BBS, and 10MWT scores during the intervention phase, and these gains were maintained during the withdrawal phase. The findings suggest that stair-walking training with KP may be effectively used to enhance balance and walking function in stroke survivors. This study provides valuable information for rehabilitation professionals seeking to establish useful stroke training programs in clinical practice. However, further studies with robust designs are required to confirm the results of this study.