Trade Minister David Parker will try to secure better rules to limit subsidisation of agriculture and fisheries when he attends a World Trade Organisation ministerial meeting in Buenos Aires.
Mr Parker leaves for the conference this weekend and New Zealand has been selected as one of its vice chairs.
"WTO members will be seeking further progress on these issues from the meeting in Buenos Aires, which builds on New Zealand's efforts in two previous meetings in Bali in 2013 and Nairobi in 2015," he said.
"I look forward to working with the Argentine chair, and with all other WTO members, in brokering a successful outcome."
The WTO sets international trade rules.