1. Academic background: Applicants need to have an academic background that meets the requirements of German higher education, usually a bachelor's degree or equivalent to a German bachelor's degree.

2. Language requirements: Most postgraduate courses in Germany are taught in German, so applicants need to provide proof of German language ability, such as German test scores (such as TestDaF or DSH) or German language course certificates. Some schools also accept postgraduate courses taught in English and need to provide proof of English language ability, such as TOEFL or IELTS scores.

3. Academic transcripts: Applicants need to provide academic transcripts of undergraduate and graduate students (if any) to prove their excellent academic ability and achievements.

4. Letter of recommendation: Usually two or three letters of recommendation are needed. The recommender can be a professor, tutor or other professional who can evaluate the academic ability and potential of the applicant.

5. Personal statement or research plan: Applicants need to write a personal statement or research plan to explain the motivation, goals and research interests of applying for studying abroad, so as to show their research potential and adaptability.

In addition, there are other application conditions that may vary from school to school and major, such as interview and portfolio. Applicants should carefully read the school's enrollment requirements and application guidelines to ensure that all conditions are met and the application materials are submitted on time.