Legal analysis: need, the collection of warranty is generally agreed in the bidding documents, laws and regulations do not specify, the proportion is generally within 2% of the amount of the subject budget.
Legal basis: "Regulations for the Implementation of the Bidding Law" Article 26 The bidder in the bidding documents require bidders to submit a bid security, the bid security shall not exceed 2% of the estimated price of the bidding project. The validity period of the bid security shall be consistent with the validity period of the bid. The bidding unit within the territory of the project for which bidding is required by law shall transfer the bidding deposit submitted in the form of cash or check from its basic account. Bidders shall not misappropriation of the bid deposit.