There was no audition or test for the applicants and they will give a performance on Monday at the Beijing Concert Hall.
After tests, the students were divided into three groups, which form three orchestras-symphony, string and percussion.
Speaking about the project, Hu, who is training the students along with his musician friends, says: "For many of them, this will be their first music summer camp experience, and the first opportunity to perform in an orchestra at a concert hall."
The camp, which runs from 8:30 am to 3 pm daily, includes basic training and rehearsals for the performance.
The camp began with the children playing Igor Stravinsky's The Rite of Spring under the guidance of Zhang Jingye, a violin teacher at the Central Conservatory of Music in Beijing.
As the artistic director of Orchestra Kids, Zhang says the project is a challenge both for the students and the teachers.
Speaking to the students, Zhang says: "I know you have been practicing the piece for days, but I want to say it doesn't matter how well you play your instrument. The important thing is you listen to others' performances and try your best to help each other."