2. Sufficient proof of financial resources: Applicants need to provide sufficient proof of financial resources to show that they have the ability to pay for travel, accommodation and other related expenses during their stay in the United States, including bank account balance certificate, payroll, tax bill, real estate certificate and other documents.
3. Clarify the travel purpose and plan: Applicants need to clearly indicate their travel purpose and provide detailed travel plans, including hotel reservations, air tickets, travel itinerary, etc. This will help the visa officer to judge the applicant's real intention and the rationality of the itinerary.
4. Stable social and economic ties: Applicants need to prove that they have stable social and economic ties outside the United States, such as work, family and property. To ensure that they can return as scheduled after the trip.
5. No criminal record: applicants need to provide proof of no criminal record to ensure that they will not cause harm to society during their stay in the United States.