For the purpose of investigating the factor of foot and calf growth of primary-school children who are fastgrowing during this period, a group of the 1st graders of primary-school had been the subject of this measurement in 1995 and thereafter they became the subject again in 1997 when they were the 3rd graders. Measurement was carried out in 30 items including height and weight and marthin-type measurer and Footprint were used for this measurement. As the result, in the part of calf, the measuring items of maximum calf circumference and knee circumference, and in the part of foot, the items of instep circumference, heel circumference, instep circumference, measured angle of big toe showed the highest growth. The average growth of length for 2 years appeared about 2cm and the parts of instep circumference, heel circumference had rapidly grown rather than in the part of foot circumference. Height growth of the part of toe was about 0.1 and in the factor analysis of foot measurement of 8-year and 10-year and children, the following findings appeared in both cases that height was related with the items of calf height and foot length and weight was related with calf circumference and breadth, foot circumference items.