The assessment of the degree of safety in seismic force calculation in designing high-rise buildings has not been mentioned in previous studies and in current standard TCVN 9386:2012 (Vietnam Institute For Building Science And Technology, 2012 which is applied for regular and irregular buildings. In normal cases, the base shear calculated by lateral force method is higher than the one calculated by response spectrum method. Therefore, it is necessary to determine the more efective and safer method. The article is aimed to propose the base shear balance between two earthquake calculation methods, namely lateral force method and response spectrum method according to ASCE 7-10 (American Society of Civil Engineers, 2010) in order to more accurately simulate the working of the structure while ensuring the structure working safely and saving materials.