A method which can well distribute optical power of each component of zoom system through analysis of Matlab to bring down excessive dependence on experiences is proposed. We treat the gaps between each component as the initial configuration, and the object distance of zoom group as free parameters, then find out the optical power distribution and movement type which meet the space requirement. Matlab simulation can draw mobile trajectory of each component in the process of zooming and analyze the drift angle, field angle and other factors affect on the system complexity, which may help to achieve the reasonable allocation of optical power and initial configuration. It is a wonderful idea for the green hands. A 14× zoom optical system is designed, and its optimized optical power allocation is close to the results of calculation using Matlab, which may verify the feasibility of the scheme.