She then joined the Song and Dance Troupe of the General Political Department (GPD) of the Chinese People's Liberation Army (PLA) as a soprano soloist.

Lei Jia has visited over twenty countries to participate in various cultural exchange activities and help introducing Chinese folk music to the world.

At the 2008 Summer Olympics closing ceremony in Beijing, Lei Jia performed a Chinese folk song, "The Moon is Bright Tonight", along with six other female vocalists.

In late 2008, Lei Jia was invited as a special guest to perform in the recital concert of Wang Hongwei, a well-known Chinese folk tenor, at the famous Golden Hall of the Musikverein in Vienna, Austria.

On 1 October 2009 at Tiananmen Square in Beijing, Lei Jia and Dai Yuqiang sang during the grand parade celebrating the 60th anniversary of the People's Republic of China.