Adrenal tumor more than 3 cm is not necessarily malignant, specific also need to combine with other indicators to make a comprehensive judgment, the final diagnosis needs to be through pathological examination. Adrenal tumors over 3 cm are only suggestive of large size, if the edges are smooth and the density is uniform, and there is no encroachment on the surrounding area, it still belongs to benign signs, and the final resection is very likely to be a benign lesion. However, the lesion may be malignant if the edge is not smooth, the density is not uniform, and the surrounding invasion, etc., and can only be diagnosed as a malignant tumor through pathological examination and discovery of tumor cells. Adrenal tumor 3 cm, even if there are no symptoms, should go to the hospital in a timely manner, under the guidance of clinicians to do standardized examination and treatment, so as not to delay the condition.