No, Tsinghua of Peking University is not a part of Yuanmingyuan. Peking University and Tsinghua University are two independent universities located in Haidian District, and Yuanmingyuan is located in an ancient royal garden in Haidian District. Although Peking University, Tsinghua and Yuanmingyuan are geographically close, they are independent of each other and have no affiliation.