Abstarct: Engineered Cementitious Composite (ECC) is a special class of Fibre Reinforced Cementitious Composite (FRCC) which undergoes strain-hardening, multiple cracking and tensile strain capacity. Material engineering of ECC consists of the relationships between material microstructures, processing, material properties, and performance. And micromechanics provide a rational lixnk between mechanical performance and material properties. Micromechanical parameters associated with fibre, matrix and interface are combined to satisfy a pair of criteria, including the first crack stress criterion and steady state cracking criterion. The satisfaction of these criteria results in a high performance fibre reinforced engineered cementitious composite with strain-hardening behaviour. While significant advantages have been achieved in the developed countries concrete industry, very limited studies have been carried out on the behaviour of ECC in Iran. The aim of this study is to develop an Engineered Cementitious Composite using local available materials. This thesis discusses in concepts of strain-hardening, multiple cracking, and steady state cracked region. Next, the result of experimental programme designed to evaluate the properties of Shahrood-ECC. Finally, through the offered method, tension behavior of ECC is modeled and micromechanics Parameters are calculated.