"Syria welcomes the positive results yielded by efforts to achieve agreement between Palestinian parties," the foreign ministry said in a statement published on Saturday by the official news agency SANA.
"Syria sees the forthcoming signing of the reconciliation agreement as a major victory for the Palestinian people in their just struggle for the liberation of their land and the recovery of their rights, as protected by Syria," the ministry statement added.
Last Wednesday's long-awaited reconciliation accord saw the secular Fatah which dominates the West Bank-based Palestinian Authority and Gaza's Islamist rulers agree to form a transitional government ahead of polls within a year.
The reconciliation agreement to be signed Tuesday came after more than 18 months of fruitless talks and was applauded by the Palestinians but strongly criticised by Israeli leaders.
Hamas, which does not recognise the Jewish state's right to exist, is considered a terrorist organisation by Israel, the United States and the European Union.
"Syria stresses the positive role played by Egypt and awaits further Palestinian measures to implement what has been agreed," the statement added.