The normal C-peptide level in human body is 0.4±0.2nmol/L in fasting state and 1.2±0.2nmol/L 2 hours after meal, C-peptide is mainly used to detect and observe the secretion function of pancreatic islet cells, and abnormal C-peptide means abnormal pancreatic islet cells. If C peptide is at high level , it means the appearance of diabetes, which will bring many negative effects to the body, usually manifested as wasting, sweating, dizziness, lack of concentration, memory loss, irritability, drowsiness and other symptoms, which need timely treatment. It can be done in terms of diet and exercise, which can effectively reduce the level of C-peptide in human body. If the C-peptide in human body continues to show high level and serious adverse symptoms appear, it should be treated by taking appropriate medication under the guidance of doctor.