China welcomes New Zealand to participate in the Belt and Road construction, Xi said, encouraging both countries to enhance cooperation in international affairs, jointly strive for an open world economy and uphold multilateralism and multilateral trading.
China attaches importance to climate change and is willing to work with New Zealand to promote the sustainable development of Pacific island countries, the president said.
He also encouraged both countries to enhance exchanges in areas including education, culture, youth and science and technology, and to host a successful China-New Zealand Year of Tourism in 2019.
Ardern thanked Xi for extending condolences over the deadly shooting incident, and expressed condolences for the loss of life in a chemical plant blast in Jiangsu Province in late March.
Noting the long history of friendship between New Zealand and China, Ardern said her country attached great importance to ties with China and was proud that the country led in many areas in developing ties with China.
Ardern said she agreed with Xi's comments on the relations between the two countries, and looked forward to strengthening the New Zealand-China comprehensive strategic partnership and deepening bilateral economic and trade cooperation and people-to-people exchanges after this visit.
She reiterated New Zealand's adherence to the one-China policy.
New Zealand pursues an independent foreign policy and firmly supports multilateralism and free trade, Ardern said, adding that the country had long supported the Belt and Road Initiative and participated in the Asian Infrastructure Investment Bank.
She said New Zealand would send a high-level delegation to the second Belt and Road Forum for International Cooperation to be held later this month in Beijing.
New Zealand is ready to enhance cooperation and coordination with China on major international issues including climate change, the prime minister said.
Ardern arrived in Beijing on Sunday for a two-day visit to China. This is her first official visit to China since becoming New Zealand's prime minister in October 2017.