Zhou Li is posthumous title, and Qin Shihuang is the year number'', right?

No, there was no title during Qin Shihuang's reign.

Year number is a title used by China feudal dynasty to record the year (it can also be used to represent the year). Generally initiated by the emperor. There was no title from the pre-Qin Dynasty to the early Han Dynasty, which was first created by Emperor Wu of the Han Dynasty after he ascended the throne. The original year number was Yuanshou, and the previous years were Jianyuan, Yuanguang and Yuanshuo. Since then, a system has been formed. Emperors of past dynasties have to change their titles whenever they encounter major events such as "good fortune from heaven" or internal troubles and foreign invasion. An emperor uses one to a dozen titles. For example, Tang Gaozong has14; Most emperors in Ming and Qing dynasties had a title, so later generations used titles as titles for emperors, such as Emperor Yongle, Emperor Qianlong and Emperor Kangxi.

The year number system originated in China. Later Silla, Korea, Japan in the late 7th century, and Vietnam in the10th century all began to use year numbers because of the influence of China. Ancient Vietnam, Korea during the Korean Empire, Korea in the early days of the founding of the People's Republic of China and the ancient Mongolian capital were influenced by China. Japan, which still maintains a monarchy, still uses the year number. Chinese mainland, Hongkong, Macau, South Korea and Viet Nam have completely abolished the title, because they have abolished the monarchy. In addition, the year of the Republic of China and the main year of Korea are often mistaken for the year number.