One Nation is preparing to target disaffected farmers, unemployed resource sector workers and young voters as it challenges the Nationals in Western Australia's rural and regional seats at the March state election.

It comes after the party revealed it had enough members to register as a party in WA and would seek formal recognition to stand candidates at the election.

One Nation leader Pauline Hanson said the party now had more than 500 WA members, and registration papers would be lodged on Tuesday.

She set out One Nation's focus, saying the issues facing people in WA were similar to those in Queensland.

"I think we are very much alike in a lot of ways, and because we are very much rural and regional areas this has a big impact," Senator Hanson told 720 ABC Perth.

"And I believe people in those sectors feel they have been forgotten by the major political parties.

"We see the decline in the farming sector, even the mining. Mining has generated a large income and the work force, now the mines are shutting down, [there are] not as much workers in the mining industry and a lot feel there's no hope for them."

Senator Hanson advocated the decentralisation of government departments from the cities to regional centres, cutting red tape for small businesses and green tape for farmers.

She will help vet local candidates for the election, mainly for the state's Upper House, but also for the Legislative Assembly.

Three One Nation candidates were elected to the Legislative Council in 2001, when the party attracted almost 10 per cent of the vote at a time when the economy was struggling.

It directed preferences away from sitting members in a move regarded as a factor in the defeat of Premier Richard Court's two-term Liberal-National government.

However, Senator Hanson would not say if she would repeat the same tactic this time.

At the federal election in July, One Nation won 20,000 more first preference votes in WA than the National Party, and secured the election of Senator Rod Culleton, while the Nationals failed to win a senate seat.

One Nation's position on Nationals' mining tax unclear

WA Nationals leader Brendon Grylls has launched a bold election strategy centred on a pitch for a new $5 per tonne production levy on iron ore.

The proposal has been attacked by the resources sector and rejected by both the Liberal and Labor parties.

But former WA One Nation upper house MP John Duncombe Fischer supported the concept and told the ABC's PM program that One Nation should adopt it.

"I would certainly hope they do because someone needs to have a really good look at the economy of this state," Mr Fischer said.

Another former WA One Nation MP, Frank Hough, did not think the party should back the plan but believed Mr Grylls had hatched it to counter One Nation's resurgence.

"I thought it was rather unusual that he came up with that," he said.

"Someone makes a quid, so we tax them, [it's] a ... lazy way of handling business."

Senator Hanson is yet to reveal her position on the Nationals' mining tax plan but recent polls suggested it was popular.

All three of the WA One Nation MPs elected in 2001 had become independents by the end of their terms and lost the 2005 election.