"If we have UNESCO's approval, we will need five years to restore the structures damaged or destroyed by IS," Maamoun Abdulkarim told AFP.
"We have the qualified staff, the knowledge and the research. With UNESCO's approval, we can start the work in a year's time."
Abdulkarim's remarks came after the Russian-backed Syrian army ousted IS from Palmyra yesterday in the climax of a three-week offensive.
"Eighty per cent of the ruins are in good shape," he said.
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IS overran Palmyra in May last year, sparking global concern for the city's spectacular ancient ruins.
The jihadists used Palmyra's ancient amphitheatre as a venue for public executions and also murdered the city's 82-year-old former antiquities chief, Khaled al-Assaad.
They also destroyed the shrine of Baal Shamin.
In September, they demolished the 2,000-year-old Temple of Bel, a gem of Classical architecture, and a month later blew up the Arch of Triumph, dating from around 200 AD.