Recent construction of building or infrastructure has included many new bridges, in an effort to create new infrastructure while disturbing the natural environment. The new bridges have created disputes over agricultural solar right in rural area. The main issues of the dispute were the reduction of crop yields and increased heating costs. To settle these solar right conflicts, it is necessary to develop an evaluation method and quantitative guidelines for determining the infringement of solar right in rural areas. The objective of this study is to develop a numerical analysis model to evaluate the infringement of agricultural solar right by the construction of infrastructure such as highway bridges. For this purpose, we have reviewed the general mediation process and proposed the numerical analysis model which is based on the WALDRAM diagram method. This model was integrated with the evaluation tool which quantitatively estimates the infringement of agricultural solar access due to the construction of building or infrastructure. And we verified the effectiveness of the proposed numerical model through the application to actual cases.