The ceasefire started at 7:00 pm local time and would last till September 19, Xinhua quoted an army statement as saying.
The army said it reserves the right to respond to any breach by the rebels.
The military ceasefire declaration comes as part of the recent deal between superpowers.
The US and Russia on Saturday announced an agreement on a nationwide ceasefire in Syria, which would commence with the start of the Muslim holiday of Eid al-Adha.
The week-long truce also includes improving humanitarian aid access and a joint military operation against banned terrorist groups.
All attacks and airstrikes will be stopped and unobstructed access will be allowed to besieged areas, including the northern city of Aleppo, according to the truce.
The Syrian government welcomed the deal.
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