The normal criteria of the ankle joint laxity of the Korean may be different from that of the western. For the objective study, we designed two devices for the anterior drawer test and inversion stress test. Using the devices we radiologically examined the 120 ankle at neutral and 30 plantar flexed position. The following results were obtained; l. In the talar tilt angle, the minimun angle, the maximun angle and the mean were 1.0°, 12.0°, 3.7° respectively at the neutral position and 1.0°, 19.0°, 4.8° respectively at the 30° plantar flexed position. 2. With the Grace method, the minimum distance, the maximum distance and the mean were 3.Omm, 12.0mm, 5.2mm respectively at the neutral position and 3.0mm, 12.6mm, 6.1mm respectively at the 30 plantar flexed position. 3. With the Kelikian method, the minmum value, the maximum value and the mean were Omm, 7.5mm, 2.2mm respectively at the neutral position and Omm, 8.0mm, 2.5mm respectively at the 30 plantar flexed posion. 4. There was no difference in laxity for the age and sex.