Why doesn't the census come directly from the household registration book?

The account information of the police station and the account book information are inaccurate, because some people have died for many years but their families have not cancelled their accounts and are still in the account book. Another person has two or more accounts. Before that, there was a room sister who had seven accounts.

In order to accurately grasp the population information, the country only conducts a census, so it cannot directly register according to the household registration book. In fact, it's not the census takers who are looking for trouble, but a lot of information is unknown from the household registration book. The census is not as simple as you think, just trying to find out how many people there are in China. In real life, many people are registered in one place, but their actual residence is in another place. There are a large number of migrant workers in China, and the population in some cities is very mobile. So it doesn't matter where your hukou is, but where you are. Only by checking all these clearly can we make effective statistics.

The other is to accurately grasp the situation of social labor force and prepare for industrial policy and development planning. Only by understanding the structural information of human resources can we accurately grasp the demand structure, urban-rural structure, regional structure, industrial structure and so on.