The definition of sustainability varies depending on the sector to which it is related. In the building sector, sustainability mainly covers "high performance building" requirements. Thus to achieve sustainable design, it is necessary to carry out a performance assessment during the design process.. In order to assess design decisions and, subsequently, building performance during the design process, building performance modelling/simulation tools have gradually become more important. In studies focusing on improving building performance simulation, assessment in the early phases of design has become the main focus in recent times. In addition to several key issues - defined within the paper as building performance, design process and building performance simulation, this paper aims to reveal the current status of energy analysis and simulation in high performance building design by evaluating the current design process. Through defining components and effective areas of analysis and simulation with the aim of achieving high performance buildings, a discussion about the possibility of developing design guidelines is introduced.