The Chinese notched her fourth win in five attempts so far this season to underline her early dominance of the women's competition.
Australia's Laura Peel came second, with Xu's compatriot Zhang Xin in third.
Xu's nearest rival on the overall leaderboard Lydia Lassila could only manage eighth on the night, leaving her 164 points adrift. Zhang is third overall, a further 32 points back.
In the men's event, Maxim Gustik topped the podium, the Belarusian edging out home hope Travis Gerrits and Michael Rossi of the US.
China's Jia Zongyang, the overall aerials leader, came in fourth but maintains a sizeable lead over second-placed Gerrits.
Women's top 10 results:
1 XU Mengtao CHN
2 PEEL Laura AUS
3 ZHANG Xin CHN
4 SCOTT Danielle AUS
5 SCHAERER Tanja SUI
6 DIDENKO Nadiya UKR
7 COOK Emily USA
8 LASSILA Lydia AUS
9 OLSEN Madison USA
10 MCKINNON Kiley USA
Men's top 10 results:
1 GUSTIK Maxim BLR
2 GERRITS Travis CAN
3 ROSSI Michael USA
4 JIA Zongyang CHN
5 FERGUSON Dylan USA
6 GRISHIN Alexei BLR
7 ABRAMENKO Oleksandr UKR
8 LAMBERT Christopher SUI
9 QI Guangpu CHN
10 LAMBERT Thomas SUI
