A four-beam 3D near-resonant optical lattice system is implemented and cold atoms are loaded into the optical lattice based on cesium magneto-optical trap and optical molasses. The dependence of the final temperature due to the Sisyphus cooling on the intensity and the frequency detuning of optical lattice are experiemently investigated，and the lifetime of the cold atoms in optical lattice are measured via the short-distance time_of_flight absorption spectra.