Burma's National League for Democracy, led by democracy campaigner Aung San Suu Kyi, has won an absolute majority in the country's parliament, the election commission has said.
Suu Kyi, who is banned by law from the country's presidency, has said she would take a position "above" the president should her party win a majority.
Burma's opposition party says it won 56 of the 57 parliamentary seats from the country's biggest city Yangon.
The result suggests a massive victory in historic elections for the National League for Democracy (NLD), led by Aung San Suu Kyi.
The party announced that it had won 44 of the 45 lower house seats and all 12 of the upper house seats in the country's largest city.
Huge cheers broke out among the crowd of red-shirted supporters outside the party headquarters as the results were announced.
Aung San Suu Kyi's opposition party is on course for a landslide victory in Burma's most democratic election for decades.
The party of Nobel peace laureate Aung San Suu Kyi is expected to prove popular, but may still face an uphill struggle in parliament.
Aung San Suu Kyi always chooses words carefully and as she uttered one sentence it emphatically sounded like a gauntlet being thrown down.