A theoretical treatment is given of the dynamics of delayed geminate recombination, in which the primary pair with high mobilities is converted into a secondary pair with low mobilities by reaction with a solute in the course of recombination. A relatively simple equation was derived which describes the dynamics, in terms of the dynamics of geminate recombination in the absence of solutes. The dynamics of delayed geminate recombination of neutral species were calculated by use of this equation as an illustration.