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In order to accurately evaluate the fire extinguishing function and performance of the airborne fire protection system, an airborne test system for the concentration of fire extinguishing agents based on the micro-pressure difference measurement technology was designed. The composite gas of fire extinguishing agent and air is collected by a vacuum pump, filtered by a filter, and then transmitted to the micro-pressure difference concentration sensing module. The gas is heated by the gas heater of the module, and the temperature controller controls the temperature of the heated gas, and then The throttling equipment is used to form a pressure difference, the pressure difference sensor is used to change the pressure difference signal into an electrical signal, and the signal processor is used to carry out signal processing to calculate the concentration of the extinguishing agent and obtain an electrical signal that is positively correlated with its concentration value; Signal, use constant flow equipment to control the flow of fire extinguishing agent and air composite gas with high precision, combine the gas flow and input it into a pressure stabilized buffer tank for buffering, and measure the correlation between the differential concentration and pressure difference between fire extinguishing agent and air composite gas through a gas analyzer , output the digital signal of fire extinguishing agent concentration, and use the exhaust port to discharge the tested fire extinguishing agent-air composite gas into the vacuum pump, and discharge the tested fire extinguishing agent-air composite gas into the air through the vacuum pump. The test shows that the system has a large measurement range, effective measurement data and high accuracy, good repeatability and stability, and the volume concentration and maintenance time of the fire extinguishing agent are longer at room temperature than at low temperature.