The Iranian girls defeated Tajikistan 3-0 in Dushanbe, Tajikistan.
Fatemeh Shaban, Zohreh Erfani and Negin Zandi scored for Iran in this match.
Iran will face Afghanistan in its second match on Monday.
The tournament has brought Tajikistan, Iran, Uzbekistan, Afghanistan and Kyrgyzstan together in a round-robin tournament.
The CAFA Junior Championship is an international football competition in Central Asia for the member nations of the Central Asian Football Association (CAFA).