1. Education background: Applicants are usually required to have a master's degree or equivalent, and have certain research foundation and achievements in related fields.

2. Academic performance: Applicants need to have excellent academic performance, including course performance and scientific research performance.

3. Research Plan: Applicants need to submit a detailed research plan, including research objectives, methods and expected results.

4. Letter of recommendation: Applicants need to provide two or three letters of recommendation from professors or tutors to prove their academic ability and research potential.

5. English proficiency: Tsinghua University doctoral programs usually require applicants to have a certain level of English, such as passing TOEFL or IELTS.

6. Comprehensive quality: applicants need to have good comprehensive quality, including academic ability, innovation ability and teamwork ability.

7. Interview: Applicants may need to attend an interview to further evaluate their academic ability and research potential.

It should be noted that the above conditions are only general requirements, and the specific admission criteria may be different for different majors and projects. Therefore, when preparing the application materials, applicants should carefully read the Tsinghua University Doctoral Admissions Guide and make corresponding preparations according to their own conditions.