Wu, the former general executive and board chairman for a cotton and linen company in Huaian, Jiangsu province, returned on Friday, according to a statement from the Central Commission for Discipline Inspection (CCDI).
Xi said the summit achieved key outcomes for improving inter-Korean ties, eased tensions on the peninsula and pushed for lasting tranquility there.
Xi's important thought on youth work pointed out the direction for the Party's youth work in the new era, he said.
Wu, also a member of the Leading Party Members Group of the CFDA, failed to follow important instructions made by the CPC Central Committee regarding medical security, according to an earlier investigation.
Xi stressed that China does not seek a trade surplus and has a "genuine desire" to increase imports, highlighting the first China International Import Expo to be held in Shanghai this November as evidence.
Xi said the timing of the visit also indicated the great importance Ardern places on relations with China.
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Xi is currently General Secretary of the CPC Central Committee, Chairman of the CPC Central Military Commission, President of the People's Republic of China (PRC), and Chairman of the PRC Central Military Commission.
Wu, a Chinese teacher at Liupanshui Experimental Primary School, has been devoting her spare time to finding out the pressing social needs of people by conducting door-to-door surveys and drafting proposals for the National People's Congress since she was selected as an NPC deputy in 2013.
Wuyuan in East China's Jiangxi province has more than 4,000 ancient houses, many built over a period of 600 years. HU DUNHUANG/CHINA DAILY
Wu's company has received Indian orders for 350 seam-sealing machines, which are vital in producing protective suits as they help prevent viruses from infecting people by attaching seal strips to medical-use gowns.