Abstract: Four NdNd³⁺-doped cadmium aluminum silicate glass samples with different doping concentration are fabricated by the high temperature melting process,and the nonlinear optical property is studied by z-scan technology while the nanosecond Nd:YAG Q-switching laser is worked as the lamp-house. The results are shown as: with the increasing of doping concentration of NdNd³⁺,the nonlinearity refractive index and the nonlinearity absorption index are increased,the measurement of the optical limiting indicates that the transmission power density and the incident power density of the sample is no longer a linear relationship when the incident power density is greater than 118mW/mm²,and with the increment of the incident power density,the transmittance reduces gradually while the transmission power density increasing slowly. With the increment of doping concentration of NdNd³⁺,the effect of optical limiting is enhanced significantly. The analysis shows that the effect of optical limiting is due to the reverse saturable absorption.