The problem of the crossing number about network topological structure graph S4is studied.Firstly,by constructing agood drawing of Star graph S4,an upper bound of the crossing number of S4is obtained.Then,the lower bound of the crossing number of S4is obtained by mathematical proof.Lastly,the conclusion is drawn that the exact value of the crossing number of S4is 8.Meanwhile,the crossing numbers of graph S4,3and graph A4,3,which are isomorphic to S4,are given.