The Australian Electoral Commission (AEC) will today launch an advertising campaign on the changes to the way senators are elected.

The changes — which will make it harder for micro parties to get elected — were passed by both Houses of Parliament last month following a marathon 28-hour session in the Senate.

Rather than placing a "1" above the line on Senate ballot papers or numbering every box below the line, the changes now mean voters number 1 to 6 above the line in order of their preferences.

Additionally, minor parties will no longer be able to swap preferences in order to secure Senate seats.

AEC spokesman Phil Diak said the national campaign would feature a 30-second television commercial, as well as advertising across radio, print media and online platforms.

Mr Diak said one television ad would launch today with a second one to air later in the week.

"The advertising will run initially for two weeks," he said.

"A further two weeks is planned, and in the event of an early election, this phase will continue during the election period."

The campaign coincides with a High Court challenge against the new laws, brought about by crossbench senator Bob Day.

The Family First Senator lodged a challenge against the reforms last month, arguing the changes to passing on preferences amounted to the potential disenfranchisement of voters.

The matter is due to be heard by the full court on May 2.

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