In this paper, the concept of Expression Mechanism of Landscape-Gene Information Unit of Traditional Settlement (EMLGIUTS) is put forward based on previous researches. EMLGIUTS is composed of three parts: expression mechanism of logic, expression mechanism of data model, mechanism of auto-extracting elements of gene, respectively. This paper goes deep into EMLGIUTS with the author's creative research of constructing Landscape-Gene Information Atlas System and the theory of landscape-gene. In order to demonstrate the EMLGIUTS, Xiangxi Phenix...