Paper reviewed laminate failure occurred by various means under tri axial loadings by using various micromechanics based failure theories applied under static loading conditions. Experimental data shows that the mechanical behaviour and progressive damage of composite laminates may be different under multi axial loading than under uniaxial loading conditions. The proposed failure model by various authors is an extension of the strain energy failure theory for tri axial loading conditions. The paper summarizes laminate failure which includes initial failure, progressive damage, and final failure for laminate composite designed with different ply and material configurations. The paper also reviewed the structure failure due to stress concentration effects arrive due to edging effects. The aim of paper is to present failure of complex composite geometries laminate under complex loading conditions. Mr. Rahul B Gunale "A Review Paper on Study of Progressive Damage of Composite Structure under Tri Axial Loading by Using Micromechanical based Failure Theories" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: https://www.ijtsrd.com/papers/ijtsrd14518.pdf