This study aimed to explore evaluation methods for the mirror system linked to children's motor skills. We examined 140 elementary school children, ranging from 1st to 4th grade. The study grouped 1st and 2nd graders as lower grades, and 3rd and 4th graders as middle grades. To assess the mirror system, we conducted imitation and mental rotation tasks. Motor skills were evaluated through various activities, including grip strength, sit-ups, sit-and-reach, standing long jumps, sideway jumps, and one-legged open-eyed stands. In the lower grades, we found correlations between the imitation tasks and several motor skills: grip strength, standing long jump, sideway jumping, and one-leg standing. However, these tasks showed no correlation with mental rotation. In contrast, for the middle grades, neither imitation nor mental rotation tasks demonstrated any correlation. These findings indicate that imitation tasks might be effective indicators for assessing motor skills in children, particularly in the early elementary years.