Niu Xianke was appointed governor of Liangzhou, saving various expenses within his jurisdiction and saving tens of thousands of military meals. Cui Xiyi served as the governor of Liangzhou on behalf of Niu Xianke and reported the situation to the court in detail. (Tang Xuanzong) ordered Zhang Lizhen, the Minister of Punishment, to review the matter, which was true. Emperor Xuanzong of the Tang Dynasty was very prosperous and wanted to make Niu Xianke a minister. Zhang Jiuling remonstrated with Emperor Xuanzong of the Tang Dynasty and said: "No, Shangshu is equivalent to the official position of Nayan in ancient times. Since the Tang Dynasty, most of them have been filled by former prime ministers. In addition, it has been filled by former prime ministers who have held important imperial or local official positions and have high moral character." , a person with a very high reputation. Niu Xianke was originally an official in the Hehuang area. He was promoted to Qingliu, which is equivalent to other high-ranking officials. This is already an abnormal appointment and now he wants to be granted a title. Appropriate. Han law said: Those who are not meritorious cannot be given. The Tang Dynasty followed the system set by Emperor Taizong. It was his duty as a general to collect food and supplies and repair weapons and equipment. For hard work, you can reward him with property, but you cannot reward him with land." Tang Xuanzong said angrily: "You dislike Niu Xianke for being a poor man, as if you are not from a noble family." Zhang Jiuling saluted. , said: "(I) am a man from the wilderness. Your Majesty thinks highly of me and uses me because of my literature. Niu Xianke made his fortune as a young official and did not study much. Han Xin was a strong man in Huaiyin, and he was ashamed to associate with Zhou Bo (Jianghou) and Guan Fu. "Your Majesty must use Niu Xianke, and I am ashamed of it." Xuanzong of Tang Dynasty was not prosperous. The next day, Li Linfu advised Tang Xuanzong: "Niu Xianke is a prime minister, how can he not be qualified for the post of minister? Zhang Jiuling is a civil servant, and he is rigidly adherent to ancient concepts, which is out of character." Tang Xuanzong was very prosperous, so he appointed him Niu Xianke is the prime minister. In the past, Zhang Shougui had accumulated a lot of military exploits, and Emperor Xuanzong of the Tang Dynasty wanted to make him prime minister. Zhang Jiuling advised: "No. The prime minister is an official position that handles national affairs on behalf of the emperor. Only qualified people can be appointed. It cannot be used to reward meritorious people. If a precedent is set, many people may have designs on this position." "The Biography" said: The decline of the country started from the abnormal appointment of officials. If you want to reward meritorious officials, you must do it according to previous precedents." Tang Xuanzong canceled this decision. Zhang Jiuling was condemned for this. From then on, the officials in the imperial court who were reprimanded for Zhang Jiuling's loyal advice only accepted their salaries and occupied their positions. No one dared to discuss policy mistakes in the imperial court.