The Device for measuring specific heat ratio of air is designed and fabricated based on wirelesstransmission.The experiment data is transmitted from the bottle to the upper computer software or mobile appby temperature and pressure sensors, and P-T, T-t, P-V diagrams can be generated. It is demonstratedexperimentally that the improved device can enable students to observe the transformation process of mediumvolume and isothermal,understand the physics of process clearly ,and the saved data can be processed furtherin next experiment.