Ma Jin (1900-1970) was named Bo Yi, named Zhanru, and also named Yunhu, also known as Boyuan. In the early years, he used the name Ma Xilin and his room name was Zhanhuaguan, a native of Beijing Daxing. In 1922, he learned painting from the Jinbei Tower and was good at painting horses. He is also good at flower and bird painting, calligraphy, engraving, and kite making. After liberation, he served as painter at Beijing Academy of Painting. In the 1930s and 1940s, when his meticulous realistic painting style matured, he had begun to strengthen the Chinese flavor in his paintings. In the 1950s and 1960s, he perfected his self-contained meticulous realistic style in paintings of horses, cows, flowers and birds, and introduced a combination of working and writing in small freehand style. His meticulous and realistic works are full of body and texture, work without restraint, fine but not broken, clean and beautiful, and both elegant and popular, which are far away from Castiglione's "very meticulous and exquisitely exposed". His small freehand works are simple and vivid, with pen and ink, and work in writing. 57*39cm