Whether the social security in the tender documents is compulsory or not depends mainly on whether the tenderer has any requirements for social security. According to China's "Bidding Law", the tenderee may, according to the requirements of the project subject to tender itself, require the potential bidders to provide relevant qualification documents and performance in the tender announcement or invitation letter, and conduct qualification examination on the potential bidders; Where the state has provisions on the qualifications of bidders, such provisions shall prevail.

The tenderer shall not restrict or exclude potential bidders with unreasonable conditions, and shall not discriminate against potential bidders.

legal ground

Article 18 of the Bidding Law of People's Republic of China (PRC), a tenderer may, according to the requirements of the project subject to tender itself, require potential bidders to provide relevant qualification documents and performance in the tender announcement or invitation to bid, and conduct qualification examination on potential bidders; Where the state has provisions on the qualifications of bidders, such provisions shall prevail. The tenderer shall not restrict or exclude potential bidders with unreasonable conditions, and shall not discriminate against potential bidders.

Article 20 of the Bidding Law of People's Republic of China (PRC) * * The bidding documents shall not require or indicate specific producers and suppliers or contain other contents that tend to or exclude potential bidders.