In earth-rock works, it is an important subject to obtain the economic and effective optimal results according to the practical situation of earth-rock allocations. The project mainly includes the mountain excavation project, embankment project and land formation project, the stones of embankment project and land formation project are taken from all the mountains engineering. On the basis of the theory of linear programming, this paper proposes an optimized earthwork computation method that is appropriate for the project, establishes the earth-rock deployment optimization model, and then obtains the optimization results. Finally, a sensitivity analysis based on the developed method is conducted which may serve as reference for further application of this method on other projects.