Yu Wenkai, whose real name is Anle, is the younger brother of Qi Huangong Yu Wenxin. During the Northern Zhou regime, because he was the son of a hero, he was named "double all-rich" at the age of three. At the age of seven, he was promoted to Anping County and granted a fief of 2,000 yuan. Yu Wenkai was very talented and tolerant when he was a teenager. His family has been military commanders for generations, and his brothers are all famous for their martial arts. Only Yu Wenkai is good at learning, reading widely, writing well and having good skills. People call him a famous father and son. At the beginning, the official position was Qian Niu, and later he was promoted to a doctor in the imperial court and a third secretary in the instrument department. When Gao Zu (Emperor Wendi of Sui Dynasty) was the Prime Minister of Northern Zhou Dynasty, he was a Chinese medicine practitioner in Yuwenkai. Later, Emperor Wendi proclaimed himself emperor, established the Sui Dynasty, and killed his political enemy, the Yuwen family. At first, Yu Wenkai was also on the killing list. Later, because he was not a clan of the Yuwen regime in the Northern Zhou Dynasty, and his brother Yuwenxin was the founding hero of the Sui Dynasty, Emperor Wendi quickly sent a letter to pardon him, and Yuwenkai was pardoned. Later, he was appointed as the deputy supervisor of Yingzong Hall, the son of Prince Zuo Shu. After the ancestral temple was completed, it was also divided into Lushan County Duke and granted thousands of fiefs. When Emperor Wendi of Sui moved the capital to Chang 'an, he thought that Yuwen Kai had a brilliant mind, and the imperial edict appointed him as the deputy supervisor of Du Ying. Although Gao Jiong is in charge of all functions and powers, all the planning comes from Yu Wenkai. Later, the Weihe River was dredged to the Yellow River to make the waterway of grain transportation unblocked, and the general manager Yu Wenkai directed the matter. Later, he was appointed as the secretariat of Laizhou, famous for his talent. Brother Yu Wenxin was killed, Yu Wenkai was dismissed from office at home, and there has been no phone call for a long time. It happened that the court used Lu Ban to repair it, because he had been isolated from the old road for a long time. Then Emperor Wendi wanted to build Renshou Palace and find someone who could be in charge of the project. Su Yang, the right assistant minister, recommended Yuwen Kai, saying that he had original ideas. Emperor Wendi of Sui adopted Su Yang's suggestion and appointed him as a calibration master. More than a year later, Yu Wenkai was awarded the post of supervisor of Renshou Palace and instrument supervisor, and later served as a junior supervisor. After Wen's death, Yuwen Kai and Su Yang were responsible for the construction of the mausoleum. Wendi was very satisfied and restored his title of Anping County Duke and thousands of fiefs. After Yang Di acceded to the throne, he wanted to move the capital to Luoyang. He appointed Yu Wenkai as the deputy supervisor of Yingdong and was soon promoted to be a great master. Yuwen Kai speculated that Yang Di's intentions were grand and extravagant, so Du Dong's organizational system was very grand. Yang-ti was very happy, and Yuwen Kai was appointed Minister of Kaifu and Minister of Industry. When the Great Wall began to be built, Emperor Yang appointed Yuwen Kai to be in charge of planning and surveying. At that time, Yang-ti went to the north to patrol, and wanted to brag about the national prestige of Rongdi and other ethnic minorities, and ordered Yu Wenkai to make a big tent that could accommodate thousands of people. Yang-ti happily gave a thousand dollars. Also made a popular temple, which can accommodate hundreds of guards and can be disassembled. There is a shaft moving rapidly under the hall, as if there is a sacred force pushing it. After seeing it, people from the tribes such as Rongdi were not surprised and afraid. Yang-ti was even happier. He gave Yuwen Kai numerous rewards before and after. Since Yongjia Rebellion, Tang Ming has been destroyed and lost. After the establishment of the Sui regime, it was ready to restore the ancient system. However, the courtiers talked about it in succession and it was difficult to reach an agreement. Yuwen Kai collected and quoted various ancient classics extensively, and wrote a Table of Tang Mingyi. Yang-ti agreed to his suggestion and plan. At this time, there was a war in Liaodong, the construction of Tang Ming was put on hold, and the construction was not completed. Yuwen Kai was promoted to Doctor Jin Guanglu because of his contribution in Liaodong Campaign. That year, he died in the office at the age of 58. Yang-ti is very sorry, posthumous title is healthy.