Police local area commands across Sydney could be merged in a bid to free up officers from administrative duties.
A proposal to merge 20 local area commands into 10 over the next two years would enable "more than 100" police in management and support roles to return to operational roles, said NSW Police Minister Mike Gallacher.
The changes would strengthen the police force, he said in a statement on Friday.
The Police Association of NSW said commands shouldn't be merged until it's clear the plan will increase the number of police on the street.
"Dramatically cutting the number of local area commands in the Sydney area needs to be backed by sound evidence that outlines the benefit to community safety," Police Association acting president Pat Gooley said in a statement.
"If the government thinks that this is the way to do it, that's fine but any model needs to be properly researched and planned with significant input from senior experienced police officers."
The government plans to merge eight branches into four this year, followed by 12 merged into six in 2014.
Mr Gooley said the government had promised no police stations would be closed and the police budget would not be reduced.
Premier Barry O'Farrell said the trial merging of the commands would reduce bureaucracy and put more police out in the community, where they were needed.
"These changes are designed to get ... more police out from behind desks, more police out doing what the public want them to do," he told reporters on Friday.
The government together with the Police Association and police hierarchy would closely monitor the trial to ensure any changes made to the command structure would improve service, he said.