A cooperation agreement refers to a document signed by two or more parties to carry out investment activities without setting up another legal person. The two sides agreed that it can only be within the scope permitted by law, and it cannot be agreed that it belongs to the field or industry where investment is prohibited; It cannot be agreed that the contract named cooperative enterprise is actually a loan contract; Can't agree to tax evasion; You can't agree to violate the foreign exchange control regulations, otherwise the contents of the signed contract may be illegal and invalid.