Dwight Dorey, national vice-chief of the Congress of Aboriginal Peoples, says the availability of housing is already a key concern for natives in towns and cities.
He fears the new rules make it even more unlikely that low-income aboriginal families will ever be in a position to afford a new home.
The rules have shortened the paydown of a mortgage to 25 from 30 years and tight standards lenders must apply before granting a mortgage.
Dorey says his organization will study the issue.
He is on a tour of Western Canada this week.