Changes to South Australia's electoral boundaries do not go far enough, the State Opposition says, despite them resulting in the Liberal Party being nominally handed two Labor-held seats.

The Electoral Districts Boundaries Commission has completed its draft redistribution report, which proposes changing the boundaries of Mawson and Elder and making them nominally Liberal.

Elder will lose suburbs including Marion and Oaklands Park, while gaining Pasadena and Colonel Light Gardens.

Mawson will lose suburbs including Old Noarlunga and Seaford Heights, while gaining parts of the Fleurieu Peninsula and Kangaroo Island.

Opposition Leader Steven Marshall said it still left SA in a situation where a party with 50 per cent of the vote might not win government.

"Let's not forget at the last election we got 53 per cent of the vote," he said.

"We still didn't form Government.

"We still have genuine concerns that we could have a repeat of that situation.

Proposed electorate name changes: Mitchell becomes Black

Mitchell becomes Black Little Para becomes Elizabeth

Little Para becomes Elizabeth Bright becomes Gibson

Bright becomes Gibson Fisher becomes Hurtle Vale

Fisher becomes Hurtle Vale Napier becomes King

Napier becomes King Goyder becomes Narungga

Goyder becomes Narungga Ashford becomes Badcoe

"The boundary redistribution has a whole pile of seats that are extraordinarily marginal so we've got real concerns."

But Premier Jay Weatherill said it was the Liberal Party who designed the current electoral rules.

"You can't complain that you've been robbed if you design the rules," he said.

"They've always been sitting back just pulling that sort of lever and hoping that three lemons are going to come up and just fall into their lap.

"They're the laziest opposition on the face of the planet and they're always hoping that somebody will actually hand it to them on a platter."

The commission's draft report will also change the names of seven electorates.

Goyder will become Narungga, the name of the Aboriginal people of Yorke Peninsula.

Ashford will become Badcoe, named after Peter John Badcoe, a Victoria Cross winner who was killed in action during the Vietnam War.

Mawson MP unfazed by proposal

Tourism Minister Leon Bignell is one of the MPs who faces major changes in his electorate of Mawson.

Under the new boundaries he will not win the next election unless he has a swing towards him.

But he said he is not worried by the proposal.

"I love meeting new people so if it turns out that the final report looks like the draft report looks, I'll be just as happy to get out there and doorknock the people like I have for the past 12 years in Parliament," he said.

"I won a seat that was 3.5 per cent Liberal in 2006."

The draft is open for submissions until September 16.