Aero pitot-static pressure system tester has direct effects on the airtightness of the air- borne pitot - static pressure system and the accuracy of meter reading. In view of the problems present in the old tester, a new tester is designed by adopting the developed oilless vacuum pump and test - display unit based on chip computer and vibrating pot pressure sensor. The result of practical use shows that the tester has characteristics of quick testing speed, high precision, visual reading, simple operation and good maintainability, etc., thus solving the problem of oil leakage polluting the air source and some related air-borne equipment.