Abstract: The actual deformation of support-type energy dissipator under seismic action can be decomposed into initial deformation in the non-damping model and indirect deformation generated by the reaction force of the energy dissipator which is opposite to the initial deformation. A specified horizontal force-Code method is proposed, which calculates the initial deformation of the proposed energy dissipator position based on the node displacement under the action of specified horizontal force in the non-damping model, and then the actual deformation of each energy dissipator in the given energy dissipator arrangement scheme is obtained by considering the influence of the reaction force of the energy dissipator. The additional damping ratio is calculated according to the Code method. An example shows that the specified horizontal force-Code method does not require the establishment of damping model or dynamic time-history analysis. The calculation results are close to those of the time-history Code method and are deterministic. Combined with genetic algorithms, it can obtain the optimal arrangement scheme of energy dissipators based on the target additional damping ratio, specifically for each layer and span of the structure, which has strong guiding significance for seismic engineering design.