In this article, by comparing the characteristic functions, we prove that for any ν-valued algebroid function w(z) defined in the unit disk with lim sup r→1− T (r, w)/ log 1 1−r = ∞ and the hyper order ρ 2 (w) = 0, the distribution of the Borel radius of w(z) and w ′ (z) is the same. This is the extension of G. Valiron's conjecture for the meromorphic functions defined in C.