By analyzing the length l of the vertex-degree sequence { k1,k2,…,kl}( 1≤k1< k2< … < kl) of the complex network with general degree distribution,the general characteristic of the length of the vertex-degree sequence is obtained in this paper,which is that l is the order of log2N( N is the number of network nodes). Meanwhile,on the basis of the real complex network datasets and the BA model datasets,the empirical analysis is performed,and the results also show this characteristic. Then,the efficiency in buil...