Duplicate kidney may cause urinary tract disorders and renal function impairment, but it is usually rarely passed on to the next generation. Duplicate kidney is a common congenital malformation in the urinary system, and some patients may have complications such as pyelonephritis, urinary tract infection, kidney stones, kidney tuberculosis, kidney tumor, ureteral cysts, etc. Long-term recurrent episodes may cause renal function damage. Although duplicated kidney is a congenital malformation, it can be detected through ultrasonography, intravenous nephrography, MRI and other examinations, and if necessary, it can be treated by surgery to achieve better results and avoid complications. Patients with duplicate kidneys are advised to go to regular hospitals for timely consultation and standardized treatment under the guidance of physicians.