Insufficiency of physical activity has been recognized as one of the critical factors that influenced health. There is a relationship between the patterns of childhood activities and adulthood physical activities For the sake of understanding childhood physical activity status, it was important to develop the appropriate physical activity measurements. Because of children's limited cognition-development ability, and their habitual physical activity differentiate from the habitual physical activity of adult, it makes the assessment of children's physical activity. Thus, worldwide researchers have devoted many efforts to developing physical activity measurement. Every instrument has its advantage and limitations. Therefore, this article will introduce the common childhood physical activity measurement and assess their merit and limitation, for clinical practitioners while they are choosing physical activity measurements.