Trend Analysis of Substitution Characteristics in The Final Stage of European Cup under the Background of New Substitution Rules

World soccer experienced several weeks of disruption in 2020 due to the New Crown epidemic, in response to which FIFA revised the cap of three substitutions in regular time to five and announced its permanent retention in 2022. We watched all 51 matches of each European Cup and collected information on the number, time, position, and reason of substitutions used by each team. The purpose of this study is to derive the trend of coaches' use of substitutions and teams' tactical changes in the final stage of the European Cup in the context of the new substitution regulation. Results: 1. The percentage of games using three or more substitutions in Euro 2020 was 92.16%, which was significant (p<0.05) when comparing the number of substitutions at right back, right wingback, center back, in the first half of overtime and in leading situations in Euro 2016. 2. The coaches' tactical substitution time tended to be in the middle of the second half when leading. A tendency to keep the remaining substitutions when tied and use them over time was noted. When falling behind, the substitution time tends to be toward the end of the second half to reduce the number of defensive players of their own team through staggered substitution and change the status quo of the team. 3. Even if a player is injured or sent off, the ample number of substitutions allows the coaches to make opposite substitutions in a short period to prevent the opponent from catching obvious loopholes.