China's Olympic champion Su Yiming survived a late scare in his final run to clinch the men's gold medal at the International Ski and Snowboard Federation (FIS) Snowboard Big Air World Cup in Beijing on Saturday, securing back-to-back victories this season.

Having won the season opener in Zhangjiakou the previous weekend, Su was determined to bag another title after posting a leading score of 177.5 points from his first two runs.

However, Japan's Kira Kimura, who sat second after the first two rounds, landed a switch backside 1980 drunk driver grab on his final attempt, scoring 91.25 points to overtake Su with a total of 178.25.

Spurred on by an enthusiastic home crowd, Su responded by repeating the switch backside 1980 melon grab from his second run but executed it better to raise his total to 181.00 points to top the podium.

"Winning back-to-back titles today was really not easy. Last year I had my worst final result here, and I told myself I had to work hard to come back stronger," said the 21-year-old. "I'm really happy to have achieved that today."

"It's a great start to the season, but it's not something I feel overly happy or proud about. Our ultimate goal is the Milan-Cortina Winter Olympics and I need to stay calm and focused, taking each day of training seriously," he added.

Su now leads the FIS men's snowboard big air standings with 200 points, followed by compatriot Ge Chunyu (112) and Kimura (109).