The Greens have rubbished the Federal Government's Healthy Welfare Card, which has been imposed on two remote communities and could be extended nationwide.

The initiative sees 80 per cent of a participant's welfare payments directed to the debit card, which cannot be used to pay for alcohol or gambling.

The cards are used in the South Australian town of Ceduna and in Kununurra in Western Australia; two areas with high Aboriginal populations.

Human Services Minister Alan Tudge today released a draft report into the two trials and announced the program would continue, subject to six-monthly reviews.

But Greens spokeswoman Rachel Siewert said the evaluation showed just 22 per cent of participants said the card made their lives better.

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"The fact is, this report here is not proof of concept," Senator Siewert said.

"The report released today shows that half of the participants felt the card made their life worse.

"People with drug and alcohol addiction will always find ways around income management, whilst others forced onto the card who have never had a problem with addiction will continue to struggle.

"I fear this may be a stepping stone to a broader rollout later down the track".

Senator Siewert also said the report relied on too much anecdotal evidence and failed to include the latest crime statistics for Ceduna.

Too early to 'reliably assess where the trial has worked'

Mr Tudge said he was "really encouraged" by the evaluation.

"A quarter of people are saying they're drinking less, a third of people are saying they're gambling less," he said.

"A quarter of people are saying they're taking fewer drugs and a third of people are saying that they're better able to look after their children.

"To me those are very, very strong results.

"It is working as well as I would have hoped to date."

But the report noted it was too early to "reliably assess where the trial has worked most and least successfully".

When asked about the prospect of a nationwide rollout of the card, Mr Tudge told Sky News: "We're considering what we might do next."

"We've made no decisions on this; we've always said that we'll take this one step time."

Opposition Leader Bill Shorten said Labor was reserving judgement on the welfare program until the final report was released mid-year.

"We were certainly open to trailing them in Ceduna and Kununurra and we were certainly very concerned, in particular, to see what we could do to reduce the scourge of alcohol abuse," he said.

"But we are reserving judgment until we've fully studied the results and I think that's what people would expect us to do."