He is on the books of Hangzhou Football Sports Management Center U14 and wears shirt number 4. His main role on the pitch is Defender.

Across the Hangzhou "Qianchao Cup" International Youth Football Invitational Tournament 2025, Si Yuxin appeared in 5 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.