Renal CT shows high density shadow of both kidneys which may be related to renal stones, renal calcification foci and other factors. It is recommended to standardize the diagnosis and treatment under the guidance of professional doctors. 1. Kidney stones: Kidney stones often start in the lower calyx and the ureteral connection of renal pelvis, and can be single or multiple, their size is very different, small ones are like corn grains, or even sediment-like, and the big ones can fill up the renal pelvis and the whole calyceum, which is a casting type of stone, and can be shown as a high-density shadow on CT. 2. Renal calcification foci: renal calcification foci usually appear in the renal parenchyma, and will be manifested as high-density shadow. Most of them are formed due to inflammation, tuberculosis and other factors leading to local calcium salt deposition. When the patient found double kidney high density shadow, it is recommended to consult a doctor in time, follow the doctor’s instructions to improve the relevant examination to clarify the diagnosis, if necessary, can be standardized treatment under the guidance of the doctor.