Abstract: The paper introduces the design of a new-style indoor formaldehyde detector.This detector is designed with the adoption of the ARM&Linux embedded platform together with CH2O/M-10 electrochemical formaldehyde-sensor made in Membrapor.The hardware architecture and the software design process of formaldehyde detector are described.A test is carried out using the formaldehyde detector designed.Comparison is made between the formaldehyde detector designed and traditional formaldehyde detectors.Resultsshow that the results obtained by the two measuring methods have no significant difference, and the detection by using formaldehyde detector is easy and quick, it can be used for the test of formaldehyde in indoor environment.