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Shoe's size and shape are determined by the last that takes shape of foot because last is the mold of shoe in development and manufacturing process. Then adaptation between foot and shoe is dependent on the last. In mass shoe production, model size is developed in the first place, other sized lasts are made through the grading process based on model size. The most important factor in grading system is grading deviation that must be same amount induced from fot measuring database. At present, most of the last manufacturing companies in korea using 260mm as a standard foot model size. When length grading deviation is 5mm, the bal girth grading deviation is 3.7mm and the ball width grading deviation is 1.2mm. I grading deviation and application method of grading system. From the analysis of foot measuring database, reasonable grading deviations are 1.2m in ball width and 0.84m in ankle height in case of length grading deviation is 5mm. I confirmed that the current grading system is very accurate. When we grade last from 230m to 290mm by current grading system based on model size 260mm, there is grading error over 1m is no problem in normal walking shoe's last, but it induces adaptation problems in sports and special purposed shoe's last. Therefore using of three standard model size is recomended in grading men's last for reducing grading deviation error under the level of 1m. It is specifically described as 235mm in 225~ 245mm, 260m in 250 ~ 270mm, 285mm in 275~ measuring project for men's last development.