The Parliamentary Inspector of the Corruption and Crime Commission has criticised the agency's handling of police brutality complaints.

The inspector found that between July 2009 and March 2011, the CCC received 381 complaints about police using excessive force, but investigated only one of them.

In a report tabled today in Parliament, he highlighted two cases, which he says should have been thoroughly investigated and recommended the Commission spend more time and money examining serious complaints.

The report says in one case, a man complained that after being handcuffed by an officer in Fremantle, he was kicked several times and tasered, forcing him to fall on his face and was later denied medical treatment.

The charges against him were later dismissed and he complained to the CCC, which referred the matter to police.

An internal investigation found the officers acted appropriately.

The Deputy Chairman of the Joint Standing Committee on the CCC John Hyde says the report's findings are shocking.

"As a member of parliament I am very concerned," he said.

The CCC says it does not have the resources to look into every case, but the Treasurer Christian Porter insists the agency is well funded.

"Over the last several years there's been a significant underspend in the CCC budget," he said.

"Now as a Treasurer, having an organisation or people on behalf of an organisation say we don't have enough money to do X, Y and Z, when you're not spending the money that you've already got, seems to me a little bit curious."