Natural fiber reinforced composite system is developed as a sustainable material and receive wide attention.Complex fiber network of the composite makes the material toughen.Nano-C/C composites using Bacteria Cellulose have been developed,and present good tribological properties.In this study,we consider a natural fiber reinforced composite with fiber network and make a multi-scale model of the composite with interface debonding under indentation loading.The fiber structure filled with polymer matrix forms a natural fiber reinforced composite.To simulate tribological properties of the composite,we make an indentation model with macroscopic homogeneous medium,microscopic inhomogeneous medium and a sphere indenter.As we evaluate effective properties of the composite as a macroscopic homogeneous medium,a homogenization theory is applied.The structure of the composite is supposed to be microscopically periodic and interconnected network system.The composite as a microscopic inhomogeneous medium is introduced a cohesive zone model of fiber-matrix interface to examine effect of interface on the indentation process.By using the model and effective properties of the composite,we perform fimite element simulation of the composite with interface debonding under indentation loading.