Labor must expand or die, according to West Australian leader Mark McGowan, who has revealed plans for local party branches to hold meetings online.

At the first party conference since the double election defeats earlier this year, Mr McGowan issued a rallying cry to members to modernise.

That will include a plan to create online branches of the party and allow party meetings to be held via Skype or a Google Hangout.

"Imagine being able to take part in some of the local branch meetings via internet from home," Mr McGowan said.

"Why can't I, or my shadow ministers, directly engage with you via the internet?"

In a bid to dilute factional influence, Mr McGowan said locals would have a much greater say in WA preselections for candidates, who would then be forced to debate rivals in front of members.

WA Labor members are also being asked to consider adopting the federal leadership election reforms at a state level.

"Now is the time to lay out the welcome mat," Mr McGowan said.

"It is the beneficiaries of successful Labor policies who hold the key to our future electoral success. We are doomed to failure if we refuse to recognise these people as 'our people'".

Continuing the theme of Labor attack since the Liberals soundly won the March state election, Mr McGowan pointed to Premier Colin Barnett's arrogance, hubris and broken promises.

"We have a premier who wrecks rather than creates," Mr McGowan said.

And the Labor leader also vowed to resurrect his Metronet public transport plan, the central plank of the losing election campaign.

"It was a great plan and I'm still asked about it virtually every day. It's not dead, far from it," Mr McGowan said.