Legal basis: Article 9 of the Regulations for the Implementation of the Bidding Law of People's Republic of China (PRC), except for the special circumstances stipulated in Article 66 of the Bidding Law, no bidding shall be conducted under any of the following circumstances: (1) irreplaceable patents or proprietary technologies are needed; (2) The purchaser may construct, produce or provide it by himself according to law; (3) Investors of franchise projects selected through bidding can construct, produce or provide them by themselves according to law; (four) the need to purchase projects, goods or services from the original winning bidder, otherwise it will affect the construction or functional requirements; (five) other special circumstances stipulated by the state. If a tenderer practices fraud in order to apply the provisions of the preceding paragraph, it belongs to the evasion of bidding as stipulated in Article 4 of the Bidding Law.