Visitors are seen at International Horticultural Exposition 2011 in Xi'an, capital of Northwest China's Shaanxi province. International Horticultural Exposition 2011 faced a tourist flow peak of more than 100,000 on Sunday.

Photo taken on May 1, 2011shows visitors at International Horticultural Exposition 2011 in Xi'an, capital of Northwest China's Shaanxi province.

Photo taken on May 1, 2011 shows visitors at International Horticultural Exposition 2011 in Xi'an, capital of Northwest China's Shaanxi province.