While she was studying in Italy, she had won numerous international competitions such as J. Aragall Spain(1st prize), Spazio musica Italy(1st Prize), Bilbao Spain, G. Spontini, G. Bizet, LauriVolpi, Zandonai, A. Catalan(Best Singer Prize).

MiJa Park made her debut though the opera <Don Pasquale> as Norina Role in Bilbao Spain, touring the cities in Italy. With another successful debut in Korea with the opera by Dong Jin Kim <Chun Hyang>, she has performed at various operas including <Rigoletto>, <L'elisir d'amore>, <La Traviata>, <Signor Bruschino>, <Don Pasquale>, <The Magic Flute>, <Le mariage de Figaro>, <La Boheme>, <Il Barbiere di Siviglia>, Isang Yun's <Sim Tjong> and <Der Traum des Liu-Tung>, Jae Myung Hyun's <Chun Hyang> and <Fidelio>, etc.

In addition to operas, MiJa Park had been also highly acclaimed at the recitals both by audiences and critics. She highly touched the audiences at the Joint-Recital with the world-top Tenor Jaume Aragall. In the recital held in Split Opera Theater in Croatia, she was highly praised by the critics by her brilliant technique and outstanding singing ability, singing Arias from Il Barbiere di Siviglia and La Traviata

Her repertoire ranges from Mozart to Contemporary. Her almost perfect pronunciations on the German, French, Italian songs were very praised by local audiences. Suitable for those acclaims, her first opera aria CD was released with the songs from coloratura to lyric soprano.

As well as the concert activities, she trains the next generations as a Professor for Voice, College of Music in Ewha Women's University in Seoul Korea.