My research plan: First, via literature review and on-site investigation, summarize public space elements. Then, learn from literature that place attachment theory has two factors: place dependence (shallow-level, emphasizing visual and functional use) and place identity (deep-level, emphasizing related historical, cultural, and personal experiences). Hypothesize that through questionnaire to collect data and statistical analysis, a positive correlation can be found between public space elements and place dependence, and that public space elements' perception can indirectly impact place identity via place dependence, affecting place attachment level. Third, aim to study the correlation; encode and quantify public space elements as can't directly research on quantitative data (affected by many factors). Fourth, conduct correlation analysis between public space elements' quantitative data and people's perception data to analyze the relationship, and by optimizing the design, enhance people's place attachment level.