Currently, the building and construction industry play an important role. However, development practices recognized as one of the main contributors to environmental problems especially in the production of electrical energy. Faculty of Engineering Universitas Indonesia (FT UI) is one of the largest on-campus electrical consumption of the UI. Because of that, needs an alternative energy to reduce the operational costs of the FT UI. One of them is with utilization of Ground Reaction Force (GRF) on the activity of walking as an alternative at FT UI. Based on the results of previous study, the value of GRF and the potential energy of human gait (walking) on the floor height change as deep as 5 cm yield the greatest value. Therefore, the need for analysis of biomechanics in human gait as design attributes of energy floor (elevation changes on the floor) with inverse dynamics model to find out the level of comfort on the human gait to the floor height of the dynamic factor by doing the calculation of knee and ankle joint moments. Based on the results that the average value of joint moment male Indonesian that walked on the dynamics floor has a value of 5 cm smaller that static floor. In summary, the comfort level can be summed up in the joint segment of the leg and foot were still comfortable conditions when walking on the dynamics floor of 5 cm.