The stab wound of cervical spinal cord is rare in clinic. A four-year boy was encountered a directly posterior stab wound in neck by a knife in an accident. He was sent to hospital with hypovolemia shock. After treatment for hypovolemia shock MRI in cervical spine was performed which showed cervical spinal cord was partly cut from dorsal in C4.At the same time the leakage of cerebrospinal fluid was found near the cervical spine C4.He was treated with operation of decompression with local debridement and ligation hemostasis. After operation he received neuro nutrition drugs and Prednisolone because of neurologic deficit. A 14-month follow-up was made. His neurologic deficit was improved but deformity of cervical kyphosis appeared.