Mr.Ali Moqbel, first, you should get the documents from your brother:
Invitation Letter from your brother in China with a Copy of his passport & residence permit or Chinese visa;

You should prepare the following documents:
1. Original passport with blank visa pages and validity of more than 6 months;

2. Application Form which must be completed neatly and signed by the applicant;

3. One passport photo

4. Copies of the kinship certificate between you and your borther

5. A No-objection letter from the your company

6. actual airline tickets showing departure from China