This study aims to explore factors of Sharestart instruction introduced in elementary education. First, it reviews literatures, generalizes experts' and scholars' opinions, develops expert questionnaire by Delphi Method and invites present teachers of elementary schools to fill in the questionnaires. It conducts evaluation and analysis by Analytic Hierarchy Process and calculates weights and overall ranking of the key factors. According to research findings, among 4 major criteria, "teacher factor" is the indicator with the most effect. The second is "students' psychological factor" and "learning capacity" and the last is "instructional method"; among 17 secondary criteria, "learning motivation", "professional growth" and "confidence" are the most significant factors. The indicators of this study can serve as reference for teachers to implement Sharestart instruction.