The genetic algorithm is used to reconstruct the shapes of multiple perfect
ly conducting cylinders. Based on the boundary condition and the measured s
cattered field, a set of nonlinear integral equations is derived and the im
aging problem is reformulated into an optimization problem. The genetic alg
orithm is then employed to find out the global extreme solution of the obje
ct function. Numerical examples are given to demonstrate the capability of
the inverse algorithm. Good reconstruction is obtained even when the multip
le scattering between two conductors is serious. In addition, the effect of
Gaussian noise on the reconstruction results: is investigated.