After his retirement as a player he eventually moved into management where he started off as an assistant before becoming the head coach of the China under-20 national team.
Early on in his career, Su had two brief trial periods with Manchester United in the 1989–90 and 1991–92 seasons, during which he made a number of appearances for the Junior A team alongside future stars such as Ryan Giggs, David Beckham and Paul Scholes.
[2] Su Maozhen made his first senior international cap against Saudi Arabia on 23 January 1994 in a 1–0 defeat.
Given another chance to make an impression for his country he was selected for the squad to play against Macau for China's 1996 AFC Asian Cup qualification campaign where on 30 January 1996 he scored his debut goal in a 7–1 victory.
During the tournament he only made one appearance against Costa Rica and once the World Cup campaign finished Su soon retired from international football.