According to Baidu Encyclopedia, "How Beautiful the Grassland is" is a song written by Tang Yixin and composed by Chun Lei. The release date is: 2011-01-20, which is included in the full house album.
Lyrics: That is the starlight of heaven. Go after it happily and make a wish for you. Be happy every year. Ah, ah, the grassland is really beautiful, and white clouds are flying in the sky.