The man accused of throwing a homemade bomb into a crowd at the Boorloo/Perth Invasion Day rally did not appear in court or enter a plea to three charges arising from the January 26 attack despite a scheduled hearing Tuesday.

Liam Alexander Hall, 32, was due to appear via video link in Perth Magistrate's Court, charged by the Commonwealth with committing an act of terrorism and State charges of intention to do harm, and possessing explosives under suspicious circumstances.

Police allege he threw a "fragment bomb" filled with ball bearings and screws into a majority-Indigenous crowd of approximately 2500 at Forrest Place in Perth's CBD on January 26.

The defence lawyer for Hall - the first person in Western Australia to be charged with a terrorism offence - indicated in court his client could use a Section 27 defence to the charges - not guilty by reason of insanity.

The 32-year-old from the northern Boorloo/Perth suburb of Warwick man has been in custody since his arrest on January 26, when police escorted him home and allegedly found items consistent with manufacturing homemade explosives.

Defence counsel Simon Freitag told the court a psychiatric report was being prepared before Hall entered pleas to the three charges, which could happen at his next appearance on May 26.

Hall is currently in a secure unit in a psychiatric hospital but did not appear in court via video link.

His matter has now been progressed to the Stirling Gardens Magistrates Court.

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