Using Nd2O3 and HCl as raw materials, Nd (phen)2Cl3 was obtained and its spectral characteristics were measured. With Nd2O3, benzoic acid and ophenanthroline as the raw material, green liquid laser medium Nd3+ ions complexes—NdB3phen (tribenzoic acidphenanthroline coNd) was prepared. The thirdorder nonlinear optical properties of NdB3phen were studied using femtosecond laser and signalbeam Zscan method. When the incident femtosecond laser pulse wavelength is 400 nm, the peak power density is 2.94×1014 W/m2, and pulse width is 117 fs, the measured nonlinear refractiveindex coefficient of the sample is －2.84×10－15 cm2/W. Under the opening aperture configuration, NdB3phen presents phenomenon of the reverse saturated absorption, and the measured twophoton absorption coefficient is estimated to be 9.11×10－12 m/W. The experimental results show that twophoton absorption coefficient and nonlinear refractiveindex coefficient of NdB3phen refractive index become more intense.