Labour leader Andrew Little says the Trans-Pacific Partnership appears to fail four out of the party's five bottom lines for supporting the deal.
The Labour Party will meet Trade Minister Tim Groser today to get its first briefing on the 12-nation trade deal.
Mr Little said Labour's position would not be clear until the full text was released after 30 days.
But he said from the details released so far, it did not appear that his party could back the TPP.
Only one of Labour's bottom lines, the upholding of the Treaty of Waitangi, had been met.