It is illegal to occupy cultivated land as construction land without approval.

In addition, according to the Interpretation of Several Issues Concerning the Specific Application of Law in the Trial of Criminal Cases of Destruction of Land Resources,

Article 3 Whoever, in violation of land management laws and regulations, illegally occupies cultivated land and uses it for other purposes, resulting in massive destruction of cultivated land, shall be convicted and punished for the crime of illegally occupying cultivated land in accordance with the provisions of Article 342 of the Criminal Law:

(a) the illegal occupation of cultivated land "a large number" refers to the illegal occupation of more than five acres of basic farmland or more than ten acres of cultivated land outside the basic farmland.

(II) Illegal occupation of cultivated land "causes a great deal of damage to cultivated land" means that the actor illegally occupies cultivated land to build kilns, build graves, build houses, dig sand, quarry, mine, borrow soil, pile up solid wastes or carry out other non-agricultural construction, resulting in serious damage or pollution to the planting conditions of cultivated land above five mu of basic farmland or above ten mu of basic farmland.

You can go to prison.

3. ditto