Left abdominal flexion is one of the clinical manifestations of splenic trauma. The typical symptom of simple splenic rupture is that after a direct blow to the left upper abdomen or a severe fall and impact, the child cannot stand upright immediately, especially with left abdominal flexion. Even can not stand up, lying position hi left side down, waist forward bending, afraid to move. So what tests are needed when the left abdomen is flexed: Since spleen rupture is mostly part of complex injuries such as falls and bruises, systemic examination must be done for each child: 1. 5 sensory reactions, neck activity, chest auscultation, spine of the limbs and blood and urine routine, at least 6h post-injury observation. 2. X-rays, CT, MRI, etc., if necessary, for safe and rapid diagnosis. 3.If natural rupture of the spleen or pathological rupture of the large spleen is considered, the cause of splenomegaly needs to be further diagnosed so that radical treatment can be performed after hemostasis. 4.Laparoscopy is not very useful in the diagnosis and treatment of splenic rupture. It can replace open abdominal exploration only when the amount of blood abdomen is not large and the abdominal signs are observed for 3 days without progress. Abdominal percussion: It is an auxiliary examination method used to check whether the abdomen is normal. The purpose of abdominal percussion is to examine three aspects of the abdomen: enlargement or reduction of the normal turbid and bulbar areas, the location and size of the abnormal turbid or bulbar areas and their change with body position, and the determination of the boundaries and size of organs or masses. In addition, the results obtained from visual and palpation can be verified and supplemented. There are direct and indirect percussion methods of abdominal percussion, but indirect percussion is mostly used because it is more reliable. ECG: In each cardiac cycle, the heart is excited by the pacing point, atria, and ventricles in succession, accompanied by bioelectric changes, and various forms of potential changes are elicited from the body surface through an electrocardiographic tracer (ECG for short). ECG is an objective indicator of the process of occurrence, propagation and recovery of cardiac excitation. ECG is the earliest, most commonly used and most basic diagnostic method in the diagnosis of coronary artery disease. Abdominal plain film: It is a photograph of the abdomen taken without introducing any contrast. When a certain organ is calcified or has a foreign body or stone impervious to X-ray due to disease, or when free gas appears in the abdominal cavity, when there is an increase in gas or fluid in the intestinal cavity or when there is dilatation of the intestinal canal, there will be a difference in density level and it will be shown on the photograph.