Zhu Jianhua of China cleared 7 feet 9 1/4 inches yesterday in preliminary competition for the country's national games to break the world high jump record, China's Xinhua News Agency reported. The old record of 7-8 3/4 was set by Gerd Wessig of East Germany in the 1980 Olympic Games in Moscow.

And in Moscow, Anna Ambrosene of the Soviet Union set a world record of 54.02 seconds for the women's 400-meter intermediate hurdles, the Soviet news agency Tass reported. The old record of 54.28 seconds was set in May 1980 by East Germany's Karin Rossley.

Zhu equaled Wessig's record on his first attempt before several hundred fans at the Peking Workers Stadium. Then, after breaking the mark, he failed in an attempt at 7-10 1/2, Xinhua reported . . .

Trond Skramstad, a member of the Mount St. Mary's track team, compiled one of the highest totals ever in a decathlon meet on U.S. soil when he won the sixth annual Maryland Invitational in Emmitsburg with 8,003 points.

Skramstad's total was nearly 1,000 points better than runner-up Brad Urshal of Princeton.

Skramstad won nine of 10 events. His 4:23 1,500-meter clocking put him over the 8,000-point mark.