① increased involuntary, uncoordinated and ineffective movements during conscious, purposeful movements that are difficult to control with will, asymmetrical postures, hand and foot tics, dance movements, difficulty in achieving fluent and complete movement skills; ② inability to coordinate the contraction sequence, direction and force magnitude of active, antagonistic, fixed and synergistic muscles, hypotonia of multiple muscles in infancy; myoclonus, myotonic (classified as tonic type), etc., quiet disappears when quiet, hyperactivity of multiple joints occurs, making it difficult to maintain posture and thus poor balance; ③ affects speech, articulation, swallowing, unique facial expressions, etc.; ④ remnants of primitive reflexes, especially asymmetrical movement patterns, the speed and range of movement controlled by skeletal fixation of the distal part of the body; difficulty in maintaining the head in a neutral position and difficulty in gaze. Difficulty in hand-to-hand and hand-eye coordination, motor dysfunction is mostly upper limb over lower limb and distal over proximal limb, which can lead to loss of balance of trunk and lower limbs and easy to fall; poor head control, inability to separate movement from trunk, and inability to maintain orthostatic position; ⑤ contracture and deformity rarely occur.