There are many ways to repair fine lines under the eyes at the age of 30~40 years old, mainly conservative treatment, physical therapy, surgical treatment and so on. 1. Conservative treatment: Beauty lovers can repair fine lines under the eyes through daily moisturizing, hydration, anti-wrinkle care, along with eye massage, hot compresses and other ways. Local injection of botulinum toxin can also be used to reduce dynamic fine lines. Injections of hyaluronic acid, collagen and so on. 2. Physical therapy: photorejuvenation, fractional laser, etc., can also repair fine lines under the eyes, and promote the subcutaneous fat collagen and elastin fibers under the eyes, so as to achieve the purpose of repair. 3. Surgery: If the fine lines under the eyes are more serious and accompanied by skin laxity and sagging phenomenon, incisions can be made in the temporal area or eyebrow area to achieve the purpose of repairing the fine lines under the eyes and tightening the skin under the eyes. There are many ways to repair fine lines under the eyes at the age of 30~40 years old, it is recommended to choose a regular hospital for consultation and choose the right way for yourself.