1792 (57th year of Qing Qianlong) On September 26th, the British government appointed Lord Magani as the special ambassador to China, leading a British delegation of more than 100 people to visit China. As a painter of the British Mission, William alexander visited Tianjin, Beijing, Chengde, Hangzhou, Guangzhou and Macau in China, and painted a lot of sketches and watercolors. After returning to England, he created a series of genre paintings about China, which reproduced the characters and scenery of China. Exhibition and publication of picture books and periodicals at the Royal Society of Art in London introduced the scenery of China, which made people in Britain and Europe have an image understanding of China and promoted the understanding of China in the West. During his stay in Macao, he painted a watercolor painting entitled "Macau Scenery from the Offshore", depicting the urban landscape of Macao in the18th century. At the same time, it also shows Britain's covet for Macao and becomes an important evidence of Macao's history and Sino-British relations.