The state government has ignored another parliamentary order to release critical documents, despite offering to show a secret report to a crucial crossbench MP.

The government will not release a report by former senior public servant David Tune into the NSW's troubled child protection system, which he described as "ineffective and unsustainable".

Despite the government arguing it could not be made public because it is a cabinet document, the Christian Democrats MP, Fred Nile, was given a promise to see the Tune report.

Community Services Minister Pru Goward: 'I do not comment on conversations I have with any of my colleagues.' Credit:AAP

Mr Nile said the Community Services Minister, Pru Goward, last week made the "very generous offer" to show him the report. The offer came before the upper house was to vote on its release.