||Pushover analysis (PO) is a well known method both for performance based design and for evaluation purpose since its simplicity and accuracy towards symmetric and short building seismic demands. The conventional PO cannot come up with the higher mode effects both in elevation and in plan (torsional effect) for tall and asymmetric building, respectively. Moreover, the conventional PO requires iteration process to get the target displacement. This research studies on advanced pushover analysis, which combines modal and mass participation factor to get new lateral load pattern, uses the inelastic spectra to get the target displacement, and uses coefficients which are established based on the study on the on real behavior of the buildings which is represented by nonlinear response history analysis (NRHA). The NRHA, basic N2, and extended N2 method are generated in a 14-storey RC building to check the accuracy of this proposed method. Displacement and inter-storey drift both in center of mass and flexible edge are used as the parameter to verify the accuracy of proposed method. The result indicates that the proposed method can predict well the seismic demand of asymmetric and tall building.