The invention discloses a liquid-state calibration product for determining the ProGRP content. The liquid-state calibration product for determining the ProGRP content is prepared from the following components: 10 to 200mmol / L of 
buffer solution, 0.1 to 0.5 percent (w / v) of 
preservative, 1 to 5 percent (w / v) of 
protein stabilizer, 5 to 10 percent (w / v) of 
sugar stabilizer, 1 to 5 percent (w / v) of EDTA (
Ethylene Diamine Tetraacetic Acid), 0.1 to 0.5 percent (w / v) of surfactant, 0 to 5000pg / mL of ProGRP 
antigen, and 1 to 10mg / L of 
aprotinin. The liquid-state calibration product for determining the ProGRP content provided by the invention has the advantages that no 
freeze drying is needed, no redissolving is needed when in use, uncontrollable factors probably occurred in a redissolving processare reduced, and a clinical detection result is more accurate. The 
sugar stabilizer, a 
metalloproteinase inhibitor (EDTA), the 
aprotinin and other components are added, so that the stability of the ProGRP 
protein is effectively improved, and the prepared ProGRP liquid-state calibration product is better in stability and can be stably stored for 12 months by being refrigerated at 2 to 8 DEG C.