Abstract: This paper studies dynamic composition and reconstruction of geographical information services through programming the geographical information services composition as the optimization problem upon on the discrete and limited data structure.This model defines and describes the semantic information of the geographical information services quality including the times,expenses,availabilities and so on.The paper acquires the weight of the geographical information service quality and evaluation function.Then this model uses these parameters to process the genetic operations and requires the optimal composition project.Finally,the paper analyzes and tests the services dynamic composition model from the composition times and composition success rates.The result inclidates that the services dynamic composition model is feasible.