Topological indices are numerical descriptors that are used in the field of mathematical chemistry to characterize the structural, biological, chemical and physical features of chemical compounds based on their molecular graphs. These are imployed in quantitative structure-activity relationship (QSAR) studies. In this paper we find the Contra Harmonic index of some networks which include hexagonal, silicate, oxide and honeycomb network and also the nanostructure TUC_4 C_8 (p,q).