On the background of the increasing contradiction between supplies and demands of water and land resources,water and land resource system coupling is studied for the optimal allocation of the regional resources.An allocation model of water and land resource system coupling is established and genetic algorithm is used to solve the multi-objective problem.In the calculation of the model established,inherent potential of the resource system is maximally considered so as to achieve the development goals of sustainable utilization of the resources.Finally,the Chanba ecological zone in Xi'an City is taken for an example to make an empirical solution and optimal results of water and land resource coupling are obtained.The study may provide a basis for the research on the allocation of water and land resource system coupling in the process of urbanization.