Peter Ellis has been granted leave to appeal his case at the Supreme Court.
The 61-year-old was jailed for 10 years for abusing seven children at the Christchurch Civic Creche in 1991.
He served seven years, but has always maintained his innocence.
He's now been diagnosed with terminal cancer and wants to clear his name before he dies.
He has failed twice in the Court of Appeal to overturn his convictions.
A key piece of evidence in Supreme Court case is a study looking into how the child witnesses were interviewed by police.
Corin Dann speaks to Professor Felicity Goodyear-Smith from Auckland University, a specialist in interviewing children in sex abuse cases and a long time supporter of Peter Ellis.