In this project, to reduce the cement content in the concrete to use the cashew net shell ash (CNSA). Most ashes have pozzolanic activity and may be used as a cement replacement material, resulting in less energy waste and low-cost composite. And also increase the strength of concrete to add the chicken feathers as a fiber. The CFF has the presence of more void space in its cross-section, so it has good resilient property. By using the CFF will save cost, eco-friendly environment and also help the fiber industry sustainable. Combination of CNSA and CFF is cost-efficient and improve the strength of the concrete block.