Magnetic field influence on thermal diffusion and chemical reaction of MHD Casson fluid flow over inclined vertical porous plates have been examined. There are coupled, coupled linear equations governing the dimensionless system. To solve these equations analytically, the perturbation approach is used. In various controlling factors, the results are displayed visually and tabulated. Our illustrations show that an intensified magnetic parameter induces a downward magnetic field. As the heat absorption increases, the temperature profile is accelerated due to higher energy levels. This can be seen in the form of higher peak temperatures and a sharper gradient in the temperature profile. On the other hand, as the chemical reaction and Schmidt number increase, the concentration distribution slows down. This is because the diffusion of the molecules is hindered by higher concentrations, resulting in a slower rate of change. This can be seen in the form of lower peak concentrations and a flatter gradient in the concentration distribution. As a result, increasing heat absorption and chemical reaction leads to a faster temperature profile and slower concentration profile.