A series of glasses with high Bi2O3 content of Bi2O3-B2O3-Ga2O3 ternary system were chosen and prepared by the conventional melt quenching methods. The densities,linear refractive indexes n0 and transmittance spectra of samples,and their relation with Ga2O3 content were measured. The third-order nonlinear-index coefficient n2 and the nonlinear absorption coefficient β of glasses were investigated at 800 nm by Z-scan technique using Ti:sapphire femto-second laser pluses. The conclusions were as follows:The values of n0 and n2 in glasses increase with increasing the Ga2O3 content. The values of n2 and β at 800 nm in the sample which had the largest refractive index in all samples are equal to 3.331×10-18 m2/W and 0.695 cm／GW,respectively. All the results show that these glasses are potential materials in the application to third-order nonlinear optical field.