Police have heckled MPs as the New South Wales Parliament passed legislation to cut benefits for injured officers.

The bill passed the Lower House today after it was approved by the Upper House late on Thursday night with the support of the Shooters and Fishers and Christian Democrats parties.

It will replace the death and disability scheme for police with a less expensive commercial income protection policy.

About 90 officers sat through the debate in the public gallery of the Legislative Assembly during, where the bill's passage was a formality given the Government's large majority in that chamber.

The officers yelled out in disgust as the vote count was announced.

"Shame, Barry, shame. Shame, Barry, shame," they chanted.

The speaker of the house Shelley Hancock reprimanded officers who had called out.

"Members of the gallery, remove yourselves from the gallery. You do yourselves no justice. Remove yourselves from the gallery," Ms Hancock said.

Ms Hancock had already warned the officers.

"In this chamber I have authority. You have authority outside, I have authority here, and I don't want to remove you but I will," she said.

Earlier NSW Police Association president Scott Weber made clear the union does not endorse the legislation.

That is despite amendment secured in return for the minor parties' support after hours of negotiations with the association.

"This is a very dark morning for all police officers in the state of New South Wales," Mr Weber said.

"In a week we've had 5,000 police officers in uniform march on Parliament House and now we've seen the ultimate betrayal last night and early this morning from the Government that has no respect for police officers doing a tough job.

"The Government can rest assured we'll continue to do all we can to make sure that we challenge this legislation."

Police Minister Mike Gallacher told ABC 702 Sydney he is prepared for the criticism.

"We've come through with a package that sees some changes, quite significant changes, in terms of the original scheme that would further protect the concerns that have been raised by the Police Association," Mr Gallacher said.

"It's fair to say that we had differing views on a raft of measures and what the Fishers and Shooters and the Christian Democrats tried to do was find a halfway point between those two set of differences."

The union says it will now hold a vote on whether to escalate its industrial action over the changes.

Police threatened earlier this week to respond only to genuine emergencies.

Opposition Leader John Robertson says industrial action would be an understandable reaction.

"I can fully appreciate the frustration of the police. Before the election Barry O'Farrell said he stood with our police, he supported our police. Last night Barry O'Farrell just walked away from them," Mr Robertson said.