Dielectronic recombination (DR) for highly charged Fe, I, Ba, Bi and U ions are calculated with our developed codes. The calculations are based on isolate resonance approximation, and the free electrons are described with a fully relativistic distorted wave. The Auger decay rates are calculated in Coulomb plus generalized Breit interaction (GBI) and Møller interaction, respectively. The two-electron integrals in the imaginary parts of GBI and Møller interactions are derived to be the product of two one-electron integrals. By comparing our calculations with published theoretical and experimental results, residual relativistic and GBI effects are discussed. DR transitions through optical forbidden decays are investigated.