Legal analysis: the government procurement challenge period is seven working days, the supplier has a challenge, in writing to the purchaser.
Legal basis: "Chinese People's **** and State Government Procurement Law" Article 52 The supplier believes that the procurement documents, the procurement process and the results of the winning bid, the transaction results in their own rights and interests have been harmed, can be in the date of knowing or should know that their rights and interests have been harmed within seven working days, in writing to the purchaser to submit a challenge.