A Christchurch police officer's second use of a Taser has been found to be disproportionate and unjustified by the police watchdog.

Police were called to a domestic incident in the city on April 19 last year, with the two attending officers told a 41-year-old man at the address had "flipped out and was uncontrollable", according to an Independent Police Conduct Authority report released on Thursday.

When the officers arrived, the man came towards them in a threatening manner.

In trying to place the man under arrest, he kicked at and punched at the officers, hitting one in the jaw.

The man was pepper sprayed and then tasered.

Taser camera footage showed the man muttering and in a trance like state - he did not respond to the officers and was suffering from the effects of being tasered.

Five seconds after the first use of the Taser, the officer uses it on the man a second time, after which he is handcuffed.

Authority chairman Sir David Carruthers said the second discharge of the Taser, despite there being no immediate threat of harm to anybody, "was disproportionate in the circumstances and an unjustified use of force".

Acting Canterbury Police District Commander Superintendent Lane Todd said the officers involved have been spoken to and reminded of appropriate Taser policy and decision-making.