What is the purpose of the author's writing? Qinghai Lake was the largest saltwater lake in China and also the highest saltwater lake in the world. This article mainly talked about what the author had seen and heard in Qinghai Lake and his deep love for this place. The author expressed his admiration and desire to explore this place by describing the beautiful scenery, unique natural environment, and long history and culture of Qinghai Lake. The core of the article can be summarized as: explore Qinghai Lake and appreciate its beauty and mystery.