Strabismus is a common eye disease that occurs in children. The main method of correcting strabismus is strabismus surgery. Most adult strabismus patients have different degrees of loss of visual function, and strabismus surgery is mainly used to solve cosmetic problems, so there is no strict requirement for the timing of strabismus surgery, and as long as there are no contraindications to surgery, there is generally no age restriction. The treatment principle of strabismus in children is “early detection and early treatment”. The meaning of early treatment also includes early surgery. The timing of surgery is different for different types of strabismus in children: 1. For children with exotropia, especially intermittent exotropia, the most suitable age for surgery is 3 to 5 years old. At this time, the child has not yet lost all the visual functions of both eyes and has not formed alternating exotropia, so the non-surgical treatment methods such as wearing glasses and convergence training can only reduce the degree of strabismus and cannot achieve the purpose of completely correcting the eye position. However, if the degree of strabismus is very small (<10°), it is better to suspend the surgery and observe the situation through non-surgical treatment, such as the increase of strabismus, then it is not too late to operate. If the exotropia is constant, the surgery should be performed within 1 year of age. 2, congenital internal strabismus children should generally be operated at the age of 1 to 2 years old to ensure the normal development of the child's visual function in both eyes. If the internal strabismus occurs after 6 months of life, it is not advisable to operate immediately, but can be treated by wearing a mirror first, if the eye position is completely corrected, no surgery is needed. If there is still residual strabismus after 6 months of wear, surgery should be performed as soon as possible. Children with congenital paralytic strabismus, especially those with compensatory head position, should be operated at the age of 3. For acquired paralytic strabismus, surgery can be considered if medication is ineffective after 6 months. 3. Children with strabismus combined with amblyopia should be treated for amblyopia first, and surgery can be considered after the visual acuity is improved. However, for severe strabismus, surgery should be performed first to correct the strabismus and then treat the amblyopia because the eye cannot gaze well. For monocular internal and external strabismus with combined intraocular disorders and unrecoverable visual acuity, the age of surgery is after 12 years old. In conclusion, except for children with unilateral strabismus and irrecoverable vision, the best age for surgery is no older than 7 years.