Abstract: The present paper examines documents related to the "stability and instability" phenomenon in sports competition and conducts a holistic, systematic and comprehensive analysis on the issue, i.e. The analysis on the relationship between sports complexity and competition stability, the analysis on the common problems affecting athletes performance between the games of specific event groups, and the quantitative analysis on the forms of stable performance in different event groups (the difficulty and beauty group, the racing group and the distance group) and the evaluation standards for stable performance.

Key words: Sports Competition, Stability, Instability, Performance