In the 20th minute Myanmar opened the scoring when Shine Thura scored with a shot from close.
Si Thu Aung made it 2-0 in the 37th minute scoring with a header.
Abduh Lestaluhu pulled a goal back for Indonesia when his cross somehow in to the goal to make the score 2-1 just before half-time.
Myanmar never let up in the second half and scored again in the 54th minute when Si scored his second goal.
In the 65th minute Myanmar got their fourth goal when Kyaw Zin Lwin scored.
Four minutes later, Ahmad Nufiandani pulled a goal back with a finish from close-range to make the score 4-2.
Indonesia threw everything into attack but could not crack the Myanmar defence and in the end the score was a fair reflection of the result.
On Thursday, Myanmar play Singapore and Indonesia are up against Cambodia on Saturday.