Strabismus is a common disease in children, with a prevalence of about 3%. Strabismus is often associated with amblyopia, and treatment can be difficult to manage, especially in preschool children, who are not cooperative. The best time to see a child with strabismus is at the age of three, when the child is more cooperative with the examination and the eye and visual development are basically mature. It is important to teach visual acuity recognition prior to the visit. The first step is to perform a dilated eye examination. The general principle is to perform an eye examination after seven days of continuous application of 1% atropine ophthalmic ointment for internal strabismus, and 15% atropine ophthalmic ointment for three days for exotropia or vertical strabismus. In principle, those with refractive error should be corrected first, and those with amblyopia should be treated first. Classification of common internal strabismus. Common internal strabismus is divided into: moderate common internal strabismus. Non-modulated common strabismus. Congenital strabismus. Adjusted common strabismus is divided into: 1. fully adjusted type. The eye position is completely orthotropic after wearing a distant vision lens. 2. Partial accommodation. The eye position is partially corrected after wearing hyperopia, but the strabismus is still apparent. Treatment of common internal strabismus. 3.Regulated or non-regulated, the treatment should be first with glasses to correct the vision, and on the basis of wearing mirrors, parallel vision, that is, treatment of amblyopia, there are many kinds of methods. Timing of surgery for common internal strabismus. Non-adjusted common internal strabismus, after wearing mirrors with parallel vision in both eyes, that is, surgery can be considered to correct the eye position, the best age should be 5-7 years old Generally speaking, the strabismic eye of non-adjusted common internal strabismus will be the amblyopic eye, or the eye with heavy amblyopia, amblyopia treatment general time to achieve parallel vision and consolidation after about 3 years. The timing of surgery for accommodative common strabismus. In fully regulated common internal strabismus, the eye position will be completely corrected after wearing glasses, but amblyopia may exist, in one or both eyes, and effective methods of treating amblyopia are also needed to gradually consolidate the treatment until complete visual parallelism is achieved after the visual acuity is parallel. Timing of surgery: If the mirror is worn orthoptically, the mirror is removed internally strabismus, the vision is parallel, and the patient does not want to wear a mirror anymore, surgery can be performed, but the age should not be too young, it should be after 18 years old. Partially adjusted internal strabismus, that is, wearing a mirror can correct part of the strabismus degree, and the remaining part should be operated in time after the binocular vision is parallel or amblyopia is cured, and preschool is the best time for the purpose of reconstructing or restoring binocular vision. Congenital internal strabismus, which generally has severe amblyopia and can be accompanied or not with refractive abnormalities, is the most difficult to cure in internal strabismus, but the positive approach, or surgery should be done early, after the basic improvement or complete correction of internal strabismus, through some treatment, such as with mirrors, masking and other amblyopia treatment, it is possible for the internal strabismus eye to gain partial vision, we believe that all 3-6 years old can Surgery. For surgery of internal strabismus, we believe that depending on the degree of strabismus, bilateral reduction of the internal rectus muscle is preferred, but one should be prepared for the possibility of two surgeries, since the surgery is almost under general anesthesia. Internal rectus muscle reduction can be performed by either internal rectus muscle recession or internal rectus muscle marginal incision with wedge resection depending on the respective habits of the operator, the advantages of the latter being: no sutures, no cutting of the muscle, never the possibility of eye puncture, never the possibility of anterior segment ischemia, and short duration with little bleeding. Treatment of common external strabismus. Except for intermittent exotropia, which can be postponed appropriately, we advocate early surgery after amblyopia is cured or vision is parallel, with the aim of restoring or reconstructing binocular vision, usually before school age, which changes the appearance of strabismus and objectively relieves the psychological burden for the child after school.