7 out of 10 people think the Good Friday Agreement remains good for Northern Ireland, though a majority now think it should be reformed.
The Northern Ireland Life and Times Survey found one in 6 think it should be removed altogether.
The study comes 25 years after the deal was signed in Belfast.
Professor Katy Hayward, who analysed the report, says the under 35s were less likely to have a positive view of the agreement:
