two classes of primitive non-powerful signed digraphs were discussed.The bounds of the bases of the primitive non-powerful signed digraphs Ds
t with two cycles and those with three cycles in which two cycles have the same length were researched.By using the definition of the base of signed digraphs and the Frobenius number
the bases on the signed digraphs Ds
t were obtained and the bounds of the bases on the signed digraphs Ds