In this paper, Fe-doped lithium niobate crystals with different Li compositions are prepared. The composition and temperature dependence of the light-induced scattering in Fe-doped lithium niobate are studied. The results show that the crystals with the com- positions lower than 49.0 mol% suffer from the serious light-induced scattering, but when the composition increases to 49.3 mol% the light-induced scattering is suppressed significantly, in particular at a composition of 49.8 mol% the light-induced scattering disappears completely. It is also found that the light-induced scattering of the crystals with lower compositions can be suppressed completely by elevating the temperature to 150 ~C. However the temperature for the complete suppression of the light-induced scattering in the crystal with a composition of 49.3 mol% is only 80 ℃. Based on these results, it is suggested that a critical Li composition may exist in a range from 48.9 mol% to 49.3 mol% and beyond this composition the suppression and temperature dependence of the light-induced scattering will change significantly.%研究了单掺铁铌酸锂晶体的光致散射行为随锂组分以及温度的变化关系．实验表明，随晶体组分的升高，光致散射得到了大幅抑制；不同组分晶体光致散射被完全抑制的温度不同．由此提出掺铁铌酸锂晶体在48．9mol％-49.3mol％范围内可能存在一临界锂组分，当晶体组分超过这一临界组分时，晶体光致散射被大幅抑制，而光致散射行为的温度依赖关系明显改变．
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