Knee valgus and knee valgus are common deformities of the lower limbs, which are often referred to as “O-leg” and “X-leg” in clinical practice. 1. Knee entropion is manifested as inward angle of the knee, and when both lower limbs are straightened or standing, a gap is formed between the two knees which can not be close together. Knee entropion is predominantly bilateral, and is rare unilaterally, and in severe cases, the knee is similar to an O-shape, which is also known as a roped leg, and those with unilateral entropion of the lower limbs are shaped like a “D-shape”, which is also known as a “D-shaped leg”. D-type leg”. 2. Knee valgus means that the knee joint turns outward, the femoral joint is tilted outward, and the ankle joints cannot be brought together in a standing position. Bilateral onset is called X-shaped leg, unilateral onset is called K-shaped leg, deformity to the femoral side is common. For knee valgus, knee valgus, usually need to carry out imaging tests, clear the specific lower limb, according to the severity of the decision whether to need surgical treatment; patients also need to pay attention to maintain the correct sitting posture, standing posture, appropriate plus some training, correct gait, to improve the deformity of the knee joint has certain benefits. The specific situation, need to go to the hospital in time, clear cause, determine the treatment program, so as not to delay the condition.