A letter of guarantee is actually a contract, and of course it has legal effect. However, a valid letter of guarantee must meet the following three conditions at the same time: 1, reflecting the true wishes of the parties. The content of the letter of commitment shall be the expression of the true meaning of the parties, and shall not be forced, threatened, lured or deceived. 2. There is no violation of relevant laws and regulations. The contents of the letter of commitment must comply with the provisions of the law and cannot violate the prohibitive provisions of laws or administrative regulations, otherwise the letter of commitment may be invalid. 3. Do not infringe upon the interests of others. The promisor can only dispose of what he has the right to dispose of, but not infringe upon the legitimate interests of others.
Legal objectivity:
Article 143 of the Civil Law of People's Republic of China (PRC) is valid if a civil juristic act meets the following conditions: (1) The actor has corresponding capacity for civil conduct; (2) the meaning is true; (three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs. Article 144 of the Civil Law of People's Republic of China (PRC) A civil juristic act carried out by a person without capacity for civil conduct is invalid.