Based on the definition of connecting relative height(CRH),CRH is diverted and structural analyzed and design system MIDAS Building is used to analyze 8 models.With different CRH,dynamic characteristics of the structure are also compared to provide references for analysis and design of the structure.The results show that,changes of CRH have a great impact on both the lower mode and the natural period of asymmetric double-tower adjacent structure.The overall trend is that natural period decreases as CRH enlarges.