When performing an architectural design or an environmental design with complicated geographical features, soil calculation is needed to study the soil balance between the amount of cut and the amount of bank. In recent years, construction activities involving small environmental load have been called for. Therefore, it is necessary to stop the discharge of surplus soil. Moreover, the result of soil calculation can show that the landscape after completion may change greatly. A system which can study soil calculation and landscape simultaneously is called for. Furthermore, to correspond to the citizen participation type design process, a system which can allow understanding of a plan by stakeholders who do not have professional knowledge is called for. This research studies landscape and soil calculation with the aim of developing a possible system. A 3D-VR system which studies environmental design is extended and a soil calculation function in which high precision calculation and visual expression are possible is developed.