The micronucleus test indicates that in the three different-dose groups of the leaching liquor of central venous catheter system, there is no increase is found in the occurrence frequency of the micronucleus and in the ratio of polychromatic erythrocytes to normoblast. 微核试验中心静脉导管系统材料浸提液在三个不同剂量组微核出现频度及多染红细胞和幼红细胞的比率未见增高。