Abstract: Automatic design and analysis of a single aspheric lens using particle swarm algorithm is presented.Particle swarm algorithm is applied to aberration correction of a single aspheric lens to meet requirements of spherical aberration.A mathematical model is constructed.And a program code is developed.Merit functions in an optical system are employed as fitness functions,which combined coefficients of a higher degree polynomial equation,a reciprocal of radius of curvature,a conic constant,thicknesses among lens surfaces and refractive indices regarding an optical system.Automatic correction of spherical aberration is performed with the function.An example shows that PSO as a tool for spherical aberration correction of a single aspheric lens is simple and effective.