The skeleton transference and the retention dynamics of i.v, ¹³⁴Cs are investigated. Results indicate that the retention percentage of ¹³⁴Cs in skeleton could be characterized by R(t) = 0.0029exp(-0.121t) with T_1/2= 5.73 d; the chromosome aberration percentage of somatic bone marrow cells increases obviously, the relationship between injected dose (X in kBq/g) and the chromosome aberration percentage can be expressed as Y = 0.0561X^0.427. It should be noted that sustained elevation of chromosomal aberration rates induced by ¹³⁴Cs can be upto the 47 th d.