China's attempts to bring more contact into the domestic game is behind the increase in violence on court and has contributed to a rise in crowd disorder, the country's basketball chief said yesterday.

Houston Rockets center Yao Ming was one of several critics who said the non-contact style prevalent in the China Basketball Association (CBA) league was producing players who were not tough enough for the international game.

After Yao and the national team bowed out of last August's Beijing Olympics in the quarter-finals, CBA teams and players were instructed to get more physical this season.

"After the Olympics, we realised that unless we strengthened our physical presence, Chinese basketball would not be able to compete with the world's best," CBA chief Liu Xiaonong told a news conference.

After the directive, however, a record 960,000 yuan ($140,500) in fines have been doled out so far this season according to the CBA, some to players for violence on and off the court and some to teams for crowd trouble.

"Some (teams) have been punished for their misbehaving fans, who were outraged partly because they did not understand the new standards the referees must enforce," Liu added.

"The league has not done a good enough job in getting the message about physicality out."