Objective: Latter kicksthe technology is horizontally in the Tae Kwon Do basic strokes in the single item and the combination technology important component, simultaneously is also the important means which the athlete scores points, after kicked technical horizontally biological mechanics and anatomy research was already detailed, but these research could not describe in precisely the movement each chief muscles forcibly characteristic, but these characteristics were precisely the trainer need, carried on the rationalization training according to these characteristics.This research uses the myo-electricity test parsing technique, after the analysis, kicks horizontally when each main forcibly muscles myo-electricity characteristic, is for the purpose of determining after high level female Tae Kwon Do athlete, kicks the technical movement mainly to send the strength muscle, the muscle horizontally to send the strength order and the duration and muscles forcibly size, take the time as the Tae Kwon Do trainen Method: Using ME-6000T8 Surface Electromyography Tester combined with synchronous video to do the EMG testing of the 6 outstanding female taekwondo athletes doing latter kicks, and using Megawin EMG analysis software combined with simultaneous video to do the integral operation on the surface EMG signals, to reach the total EMG, electromyography smooth and duration when doing latter kicks.Through testing EMG of each muscle under the same load, we could get the ratio of Muscle strength and EMG, and then change the muscle EMG for latter kickers into muscle strength.Resurts: (1) The activities of the main muscles in the movement of back Cross kick.Figure 1 shows that the vastus medialis, rectus femoris, vastus lateralis and the medial head and lateral head of gastrocnemius regardless of the supporting leg or swing leg has greater force and the gluteus maximus of support leg has greater force also.(2) The duration and the order of the main muscle force.The order of the muscle for supporting force is as follows: Hip muscles force at first to the extend the hip and make the hip turn,and then quadriceps femoris force to extend the hip and muscle in the front of leg to make the ankle dorsiflexion.The duration of the muscle in the front of leg is longer than the others, the left Rectus femoris and the left Vastus medialis force later and shorter than the others in knees and hips.the durathion of the ohers force is 0.25-3 s.Discharge order of the muscles of swing leg is that right erector spinac, right biceps fcmoris, right vastus lateralis and right tibialis anterior discharged at the beginning of the movement synchronously, and secondly, it was left and right semitendinosus semimembranosus, right tensor fascia, right gastrocnemius, right rectus femoris, right vastus medialis, right gluteus maximus and right rectus abdominis respectively.The discharge duration of muscles was different.The longest was right tibial anterior, and followed by right tensor fascia, gastrocnemius and the anterior and posterior thigh muscles.Conclution: Both the supporting leg or swing leg, triceps surae, quadriceps and the muscles around the hip joint is main muscle groups to complete the movement of back Cross kick.Both the supporting or swing leg muscle mobilization in the order did not strictly follow the discharge of the law that the large muscles around the joints first discharge, small muscles later.