The purpose of this study was to explore the effect of Taekwondo jejari ditgi(step) on the accuracy of coincident anticipation timing. To achieve this purpose, 13 Taekwondo athletics (age; 15.15±.80, hight; 167.38±10.32 carrier; 4.0±1.91) were participated in Apdollyeo Chagi task with 2 different ditgis (ditgi or non-ditgi) and 2 different stimulus speeds (5mph and 8mph). Instruments of measurement were Modified Bassin Anticipation Timer (1475mm long×85mm wide) (Lafayette Instruments Co.) for the experimental test. Three separated 2×2 (ditgi×stimulus speed) ANOVAs with repeated measures were utilized for constant (CE), absolute (AE) and variable (VE) errors, respectively. The results suggested that; CE of ditgi condition compared with non-ditgi was significantly small in 5mile speed, was similar in 8mile. AE of ditgi condition compared with non-ditgi in 5mile was significantly small but AE of non-ditgi condition compared with ditgi in 8mile was significantly small. VE of ditgi condition compared with non-ditgi in 5mile was significantly small but in 8mail was similar. Mean of this results was discussed.