According to Baidu's query, the disclosure time of purchase intention should be as early as possible, in principle, not later than 30 days before the purchase activity begins. The public contents shall include the name of the procurement project, the general situation of procurement demand, the budget amount, the estimated procurement time, etc. For the procurement projects that are urgently needed due to unforeseen reasons of the budget unit, the procurement intention may not be disclosed.

The purchase letter of intent is an agreement between the two parties to determine the purchase cooperation intention according to the material demand plan. In the process of formal implementation, it is necessary to reach an agreement on the contents of the formal contract and determine strategic cooperation.