A drug trafficker who was covertly tracked by police has pleaded guilty mid-trial.

Trong Ruyen Bui, 45, was accused of trafficking heroin and ice in Canberra in 2012, and was on trial before Justice John Burns.

The court heard that Bui's phone calls were tapped by police, and he was under physical surveillance for some time.

His car and home were searched in July 2012, revealing heroin, ice, drug paraphernalia and a number of mobile phones.

Crown prosecutor John Lundy said Bui's DNA was linked to drugs found at his two-storey home and in another man's car.

Bui was originally fighting the charges, but pleaded guilty to both counts on Tuesday, the second day of the trial.

He will be sentenced in the ACT Supreme Court next month.

Christopher Knaus