1. The growth rate is relatively slow, usually less than 5 cm per year; 2. The height is below the lowest value of the normal range. For the criteria of normal height, please see another article: What is dwarfism?3. The bone age is about the same as the actual age or mildly lagging behind;4. The body is well-proportioned, without deformity, without obvious chronic organ diseases such as liver, kidney, heart and lung;5. The two growth hormone excitation tests are normal, with a peak value greater than 10ng/ml, which means there is no growth hormone deficiency. At present, growth hormone is also used to treat idiopathic dwarfism, because it is not growth hormone deficiency, the response varies from person to person, some effects can be accelerated growth and improve lifetime height; some effects are not so obvious.