Legal basis: Article 31 of the Accounting Standards for Business Enterprises refers to assets that have been used by enterprises for a long time but have no physical form, including patents, non-patented technologies, trademarks, copyrights, land use rights and goodwill. The purchased intangible assets shall be accounted for according to the actual cost; Intangible assets acquired by accepting investment shall be accounted for according to the price confirmed by evaluation or agreed in the contract; Self-developed intangible assets shall be accounted for according to the actual expenses incurred in the development process.