2008-05-13 11:12:20 Xinhua)China's air force says it will resort to parachute landing to send relief troops to the blocked epicenter of Wenchuan if weather forbids helicopter landing.

About 4,500 Chinese soldiers, to be sent by air to the quake-striken Wenchuan county for emergency aid, boards the aircrafts at an airport in central China's Kaifeng, Henan Province, Tuesday morning, May 13, 2008.

About 4,500 Chinese soldiers, to be sent by air to the quake-striken Wenchuan county for emergency aid, boards the aircrafts at an airport in central China's Kaifeng, Henan Province, Tuesday morning, May 13, 2008.

About 4,500 Chinese soldiers, to be sent by air to the quake-striken Wenchuan county for emergency aid, boards the aircrafts at an airport in central China's Kaifeng, Henan Province, Tuesday morning, May 13, 2008.