The second main theorem of holomorphic maps from C into Pⁿ(C) of zero order was studied.According to the method and skill of other documents for processing heavy values,the second main theorem of generalized Nevanlinna was obtained from the view angle of difference operators,that is,the second main theorem about the holomorphic maps of zero-order on Pⁿ(C),which are related to the q,c difference operator.By virtue of the theorem,it is proved that W^Δ_q,c(f)≡0,if f and Δ_q,cf share at least N+2 hyperplanes in general positions on Pⁿ(C),and the results of holomorphic maps uniqueness are improved and generalized.