Pediatric duplicated kidney does not have specific signs and symptoms, often in the form of comorbidities, because the clinical symptoms are similar, there will be misdiagnosis or delayed treatment above the treatment and diagnosis, most children have an early age of onset, however, the diagnosis is delayed to varying degrees, the clinical manifestations are abdominal pain, urinary frequency, urinary urgency, painful urination plus dripping and recurrent fever and other symptoms. The urine from the ectopic opening is uncontrolled and dripping occurs, and the child may dribble urine on his pants in the middle after normal urination. The problem of difficult urination is mainly due to the cyst at the end of the ureter of the duplicated kidney, which comes out and blocks the urethral opening causing urethral obstruction, so it is difficult to urinate. The most common is urinary tract infection. The end of the ureter of the duplicated kidney is narrowed, and urine is not excreted smoothly, and urine accumulates in the kidney and ureter for a long time, leading to urinary tract infection, often combined with fever and other symptoms.