With years of disease progression, a small amount of albumin in the blood of nephropathy patients started to leak into the urine, however very likely to be ignored due to mild clinical symptoms or confused with proteinuria caused by hypertension and/or hyperlipidemia with progress. But when other biomarkers of renal function are also found significantly increased in urine, such as β2 microglobulin α1 microglobulin, transferrin and immunoglobulin, the renal function has been impacted by pathological changes. At present, there is no effective method except hormone for nephropathy proteinuria treatment, and long-term hormone treatment will bring many side effects to patients. If the course of disease progresses freely, more protein will leak into the urine, and the renal damage will be getting worse. Cobrotoxin polypeptide molecule can effectively reduce the leakage/proteinuria, control and delay the renal pathological progression and improve renal function by inhibiting the autoimmune inflammatory response of kidney, thus contribute significantly to the treatment of nephropathy.