Abstract: Objective: To study the optical properties of five kinds of dental LED curing lights to provide reference for selecting appropriate curing lights in dental practice. Methods: Five new dental LED curing lights were included in this study, including LC-VIIIB (Hangzhou Sifang Medical Apparatus), DemiPlus (Kerr), Elipar S10 (3M ESPE), Elipar (3M ESPE), and VALO (Ultradent). The waveform, wave peak and light intensity change of them were tested by the irradiance spectrograph and analyzed by the Bwsped4 software. The light intensity was compared by SPSS 18. Results: The maximum absorption wavelengths of 5 lights were all close to 460 nm. The trend of light intensity of each light had its own characteristics, but relatively stable. The intensities in descending order were as follows: VALO>Elipar>Elipar S10>SLC-VIIIB>DemiPlus. Conclusion: It can be preliminarily concluded that, among 5 LED curing lights, the optical property of the VALO is the best for its wide absorption spectrum, short time, high power and good efficiency.