INTRODUCTION SHAHID BEHESHTI PORT IS LOCATED ALONG THE SOUTH EASTERN COASTLINE OF IRAN, IN THE PROVINCE OF SISTAN-BALUCHISTAN AT LONGITUDE AND LATITUDE OF 60O 31’ AND 25O 12’ RESPECTIVELY. IT IS SITUATED AT THE INNER SIDE OF THE SOUTH EASTERN HEADLAND OF CHABAHAR BAY. FOR THE FIRST PHASE DEVELOPMENT OF SHAHID BEHESHTI PORT, EXISTING BREAKWATER SHOULD BE EXTENDED ABOUT 1650M. CURRENTLY A BREAKWATER EXISTS IN THE PORT AREA AND THE MAIN PURPOSE FOR ITS EXTENSION IS TO PROVIDE ACCEPTABLE CALMNESS AT THE LOCATIONS OF NEW BERTHING STRUCTURE AS WELL AS NAVIGATION CHANNEL. THE OVERALL OF THE FIRST PHASE DEVELOPMENT OF THE PROJECT INVOLVES DREDGING OF APPROACH CHANNEL AND BASIN, RECLAMATION OF NEW LAND FOR THE PORT EXPANSION, EXTENSION OF THE EXISTING BREAKWATER, CONSTRUCTION OF A NEW CONTAINER TERMINAL AND MULTI-PURPOSE TERMINAL, AND SUPPLY AS WELL AS COMMISSIONING OF CARGO HANDLING EQUIPMENT.THREE DIFFERENT ALTERNATIVES ARE DESIGNED FOR EXTENSION OF BREAKWATER AND COMPARED ACCORDING TO TECHNICAL, COMMERCIAL AND CONSTRUCTION ASPECTS. CONVENTIONAL RUBBLE MOUND BREAKWATER WITH TETRAPOD AND X-BLOC ARMOUR UNIT AND BERM BREAKWATER ARE THESE THREE CONSIDERED ALTERNATIVES.AMONG THEM, RUBBLE MOUND BREAKWATER WIT X-BLOC ARMOUR UNIT IS DETERMINED TO BE THE BEST CHOICE BECAUSE OF ITS ADEQUATE STABILITY, ECONOMICAL BENEFITS AND EASY CONSTRUCTION.