The contribution describes the LFS (Landfill Simulation) program for modeling of gas flow in landfill or other disintegrated material. This program is created in development environment of the Delphi program. The creation of the program based on the need of simulation of the gas exhaustion in landfills of garbage. On the basis of the parameters set (porosity, quantity of arising gas, material resistance against the gas flow, number of bore holes etc.) the program solves the pressures in single parts of landfill and also the quantity and concentration of methane in the gas being exhausted. The goal of the program is time simulation of physical values changes under the change of pressure conditions during the gas evolution or under change of pressure conditions arisen due to gas exhaustion or only due to venting of garbage landfill.