WA Premier Colin Barnett says one of his candidates did the wrong thing by handing out free bottles of wine for next month's state election.

But Mr Barnett defended Lily Chen, saying she was a "fantastic person", after the Mirrabooka Liberal candidate apologised for handing out the wine bottles while doorknocking.

The bottles were labelled "Lily Chen Liberal for Mirrabooka", describing her as "The Change Mirrabooka Needs".

The Liberals said the distribution of the wine bottles was "in keeping with Chinese traditions and in recognition of Chinese New Year".

But in a statement, the party said Ms Chen now accepted it was an error in judgement.

"She apologises unreservedly for any offence that has been caused," a party spokesperson said.

Candidates 'sometimes get carried away'

Mr Barnett said handing out wine bottles was "not the way to go".

"Look, it was not the right thing to do, but we like to be inclusive and respect different cultures and traditions," Mr Barnett said.

"It may not be the traditional Australian conservative way but maybe it is part of Chinese culture, I don't know.

Mr Barnett says giving out wine "may be part of Chinese culture". ( ABC News: Jacob Kagi )

"Lily is a fantastic person and highly qualified … she would be a fantastic person to see in Parliament."

Labor leader Mark McGowan said it was "pretty poor form" to be handing out free wine.

"It is actually, I think, illegal," he said.

"It shows the desperate measures the Liberal Party is using to try to win the election."

The issue with Ms Chen emerged a day after a Liberal Upper House candidate lied about his identity on talkback radio.

South West candidate Wade de Campo identified himself as "John from Collie" when he called ABC South West to question Labor leader Mark McGowan, but his voice and phone number were recognised by the show's producers.

Asked if he was frustrated by candidate behaviour providing distractions, Mr Barnett said some issues were to be expected.

"Sometimes candidates get a bit too excited and get carried away," Mr Barnett said.

After a redistribution, Labor holds the seat Ms Chen is contesting by 4.6 per cent.