Planar laser-induced fluorescence（ PLIF） temperature measurement system for liquid film is constructed based on PLIF temperature measurement and high-speed photography technology. ARM software program for temperature control system is designed based on UCOS Ⅱ and UCGUI. The calibration of PLIF temperature measurement system is carried out and the temperature field measurement and temperature measurement error analysis of the liquid film are realized according to the calibration curve. The experimental results show that the temperature measurement error of PLIF liquid film temperature measurement system is less than 2 %. This system has properties of non-invasion

high temporal and spatial resolution and it is suitable for industrial liquid film temperature measurement process.