The optical nonlinear properties of BTN-SubPc spin-coating films were measured by means of Z-scan technique using a mode-locked Nd∶YAG laser with 38 ps pulse excitation at 1.064 μm and 532 nm. The reverse saturation absorption at 532 nm and the two-photon absorption at 1.064 μm were observed and the corresponding coefficients were determined. The resonant value of 6.7×10 -10 esu at 532 nm and the off-resonant value of 6.1×10 -12 esu at 1.064 μm of third-order optical nonlinear susceptibilities χ (3) were measured respectively, which were much bigger than those obtained for phthalocyanines. These results show that BTN-SubPc films are promising materials for nonlinear optical applications.