The resonant charge‐exchange by ion‐ion collisions in nonideal plasmas are investigated. The interaction potential in nonideal plasmas is given by an pseudopotential model taking into account the plasma screening effect as well as the nonideal collective effect. The screened atomic states in nonideal plasmas are obtained by the variational principle and the perturbational analysis. The semiclassical straight‐line trajectory method is used to describe the behavior of the projectile ion. The maximum position of the resonant charge‐exchange probability, i.e., the position which takes place the resonant change‐exchange process, is found to be receded from the target ion with increasing nonideal effect. © 2004 American Institute of Physics