An offer can be revoked, except in one of the following circumstances: the offeror clearly indicates that the offer is irrevocable by determining the time limit for acceptance or by other means; The offeree has reason to believe that the offer is irrevocable and has made reasonable preparations for the performance of the contract. If the expression of intention to cancel the offer is made through dialogue, the content of the expression of intention should be known to the offeree before the offeree makes an acceptance; If the intention to cancel the offer is made in a non-dialogue way, it shall reach the offeree before the offeree makes an acceptance.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 471 The parties may conclude a contract by offer, acceptance or other means.

Article 472 An offer is an expression of intention to conclude a contract with another person and shall meet the following conditions:

Specific content;

(2) The offeror is bound by the expression of will by indicating that he has accepted the offer.

An invitation to offer is an expression of the hope that others will make an offer to themselves. Auction announcement, tender announcement, prospectus, bond raising method, fund raising prospectus, commercial advertisement, publicity and price list sent are all invitations to offer. If the contents of commercial advertisements and propaganda meet the conditions of the offer, it constitutes an offer.