Using the Zalcman lemma, it is proved that let F be a family of holomorphic functions in a domain D, k(≥2) be a positive integer and let P(z) be a polynomial and ∂(P ( z ) < k. If each fεF, K be a positive integer, when f(z) = P(z) ,z ε D,then If(k) I ≤ K, where f and f shared P(z), then F is normal in D. Some normality criterions proved by XU Yan and LIU Zhi...