Spastic squint is a common clinical dystonia, which is a kind of limited dystonia, mainly due to the spontaneous involuntary contraction of sternocleidomastoid, trapezius and other neck muscles, resulting in abnormal posture or movement. Professor Wang explained that spastic squinting neck is mainly manifested by the involuntary contraction of neck muscles and the increased movement and abnormal posture of the head and neck, as well as the involuntary twisting, lateral tilting, forward flexion and backward tilting of the head and neck, which are often a combination of different movement directions and different degrees. Since spastic squint has similar symptoms to other diseases, it is often misdiagnosed. Therefore, attention should be paid to the differential diagnosis with the following diseases: 1. Upper cervical spine lesions: such as rib pain, injury, cervical disc herniation, etc. Patients often complain of neck discomfort, atrophy of one side of the cervical muscles, and the head can be tilted without spasm-like episodes. Also, all of the above lesions may have sensory motor and reflex changes in the upper extremities. In contrast, spastic squint has no effect on upper limb function. 2.Craniocervical junction lesions: such as severe craniocervical junction deformity. These patients often have symptoms of craniocervical junction nerve compression, such as unstable walking, swallowing difficulties, decreased muscle strength of the limbs, increased reflexes and muscle tone. They also show thickening of the neck and low posterior hairline. In the presence of spinal cord cavitation, there may also be muscle atrophy of the upper extremities and segmental pain-touch dissociation. Similarly, the patient may have a sloping neck, but will not have spastic attacks. 3, congenital atrophy of the sternocleidomastoid muscle on one side: common in children, mostly due to birth injuries. The muscles on the lesion side are atrophied. The normal side of the muscle have compensatory hypertrophy, but there will be no spastic attacks. 4, posterior cranial myalgia in children: the patient has forced head position in order to relieve pain, resulting in stiffness of certain muscles in the neck, although there is a head tilt posture, the same will not have spasmodic seizures. At the same time, the patient has obvious posterior cranial symptoms, such as headache, vomiting, unsteadiness in walking, nystagmus, and a short medical history. Children should also be distinguished from oculocerebral tilt, because one side of the eye has lesions, most of which are paralysis of certain eye muscles, resulting in the child’s head in a certain tilted position when looking at objects. Finally, it should be distinguished from hysterical squint. Patients have clear mental factors, sudden attacks, changing symptoms, irregularity, and symptoms disappear soon after emotional stability.