Normal height for 17 year old boys is around 1.7 meters. There is actually no fixed figure for the normal height of a 17-year-old boy. Among children of the same age, height can vary, mainly affected by genetics, sleep, nutrition, exercise and other factors, there can be a large difference, can be more than the average difference up and down 10-20 cm. Genetic factors will greatly affect the height, usually, the father’s height is higher, the height of the offspring is also higher; if the quality of sleep is guaranteed, then the night can secrete more growth hormone, thus promoting the development of human bones. Adequate supplementation of nutrients, such as protein, calcium and iron, can effectively promote the growth of the human body; Exercise can significantly affect the height, such as stretching exercises. For boys who are on the shorter side, they can promote growth with a reasonable diet and regular physical exercise. If the height has been short, you can go to the hospital to improve the relevant examination, to exclude pathological causes.