Abstract: Comparing the coupled differential equations of a TLCD (tuned liquid column damper)-structure and a TMD (tuned mass damper)-structural system for plan-symmetric and plan-asymmetric buildings, the mass ratio, the optimal frequency ratio, the natural frequency, and the damping of a main structure are achieved. The transformation of a TLCD-structure to a TMD-structure system is investigated. The modal tuning of the TLCD (frequency ratio and damping) is classically performed by applying the Den Hartog optimization criterion. The analysis of structural vibration control using finite element software is presented. A single-storey plan-asymmetric structure and a 20-storey benchmark model with a single TLCD or TLCDs are numerical simulated; the TLCD parameters using Den Hartog formula are obtained; and the structural analysis by SAP 2000 software is performed and compared with the results obtained from MATLAB. It is shown that the method for transforming a TLCD-structure to a TMD-structure system is reasonable and feasible.