采用同位素示踪技术，研究了稀土元素镧在草鱼（Ｃｔｅｎｏｐｈａｒｙｎｇｏｄｏｎｉｄｅｌｌｕｓ）体各组织器官中的分布及积累状况。结果表明，草鱼对稀土元素吸收积累能力较弱，但各组器官中镧分布差异较大，积累量依次为鳃＞内脏＞鳞＞头＞骨骼＞肌肉；高浓度（１０ｍｇ／Ｌ）处理组鱼体中镧的积累量明显高于低浓度（２ｍｇ／Ｌ）处理组，但两组的积累能力（ＣＦ值）差异不大。 The distribution and accumulation of lanthanum in tissues and organs of Ctenopharyngodonidellus were studied by isotope tracing technique. The results showed that grass carp had less ability to absorb and accumulate rare earth elements, but lanthanum was significantly different in different organs, with the order of gill> internal organs> scale> head> bone> muscle; The accumulation of lanthanum in the body was significantly higher than that in the low concentration (2mg / L) treatment group, but there was no significant difference in the accumulation ability (CF value) between the two groups.