Based on the analysis about the calculation method of relative depth of compression zone in comsmall eccentricity as Code for Design of Concrete Structures (GBS0010 -2002 ), it was believed that the relative depth of compression zone in compression elements with small eccentricity which was calculated by the method of the design code has a lager error compared with the actual one in many situations, and the error will lead to some more or some less requirement of reinforcement. To make the design for compression elements with small eccentrici...