If the epiphysis of a 20-year-old girl is not completely closed, she can promote the growth of height through moderate exercise, adjust the diet, ensure sleep and other methods. 1. Moderate exercise: 20-year-old girls can promote height growth through exercise, such as touching objects as high as possible to promote muscle stretching or jumping rope, jumping high. 2. Adjust the diet: 20-year-old girls if there is a need to grow taller, you need to supplement calcium, eat food rich in protein, vitamin D, regular diet, nutrition should be balanced, food diversity. 3. Ensure sleep: the human body will secrete more growth hormone in the sleep state, and good sleep will promote the growth of the human body, so you should ensure sufficient sleep. Height is mainly related to genetics, nutrition and other factors, 20-year-old girls can still grow taller, but also with the epiphysis of the situation, you can go to the hospital to check the epiphysis.