The present thesis offers two methods for the analysis and design of long columns according to the new Egyptian code for limit state design of reinforced concrete structures. A theoretical study of the basic assumptions and methods of stress analysis of columns subject to axial loads, biaxial moment is presented. A computer program to carry out the above analysis and create the interaction surface for long column which taking the boundary conditions into consideration is developed. ”A simple method to design long column according the code of practice has been derived and presented in closed form >and design tables. Two realistic columns of different shapes, reinforcement and end conditions have been used to demonstrate both methods. A discussion and compansons between the two methods are given with the conclusions drown from the above study.