The transmission and absorption spectra of the Te/TeO2-SiO2 thin film were obtained by using a spectrophotometer, with the surface plasmon rensoance (SPR) observed at 480 nm. While the dependence of the third-order nonlinear susceptibility of composite films on the Te particle was investigated by Z-scan technique with renosant wavelength (532 nm) and non-renosant wavelength (1064 nm). Optical properties of these films was analyzed using the effective medium theory, and the relationship was investigated to obtain Te particle size and nonlinear optical properties of Te/TeO2-SiO2 films. The results show that the Te particle size was smaller, the number of particles was increased, and the particle distribution tends to be uniform. The surface plasmon resonance peak was red-shifted, and the absorption intensity was enhanced; and the third-order nonlinear optical effects was enhanced, χ(3) was increased by 5.12×10-7 esu at 1064 nm to 8.11×10-7 esu at 532 nm with preparation potential increased.