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Introduction/Background When an evaluation focuses on movement, there is little chance of error by oversight, even by an inexperienced therapist. This study aimed to clarify relationship between the medial longitudinal arch (MLA), foot dorsiflexion range of motion (DF), and the dynamic gait parameters. Material and method This study evaluated 20 participants (16 males, 4 females; mean age 21.2 ± 0.4 years). MLA was measured using the navicular drop test (ND) developed by Brody. DF was measured with the knee in extension. Dynamic data were collected with a 9-camera, motion capture system with 3 force plates. The participants performed barefoot gait five times. The gait parameters were navicular height, DF, dynamic navicular drop, ankle moment peak value in stance phase (AMP), and maximum dorsiflexion range of motion, with the ankle moment value and DF measured at 12%, 31%, and 50% of the gait cycle, respectively. These gait parameters were compared using coefficients of correlation for ND and DF. For statistical analysis, we used Pearson's correlation coefficient using the IBM SPSS statistical software (version 21), and P < 0.05 was considered as significant. This study was approved by the Ethics Committees for Human Research of Gunma Paz University. Results ND did not show a relationship with any gait parameters. However, DF showed a negative correlation with ankle moment at 50% ( P = 0.003, r = −0.623) and AMP ( P = 0.008, r = −0.574) Conclusion These findings show that DF is more important than ND in gait assessment. In the terminal stance, when DF is limited, the ankle moment shows a higher value. When DF is larger, this is reversed. Eccentric contraction using stretch-reflection was observed in the terminal stance phase. In our opinion, a reflective factor strongly influences gait movement. Thus, evaluation of DF before gait assessment is essential. [ABSTRACT FROM AUTHOR]