When is your current visa valid for? and what type? But if your visa expires when you re-enter China, you need to apply for a new one from Chinese embassy in Nepal. The requirements are as follows:
1. The original passport with at least six-month validity and two blank visa pages, one photocopy of the passport page containing the personal particulars.
2. Truly completed and signed Visa Application Form of China. with one recent passport-photo size color photograph.
3. Visa Notification Form issued by the authorized government departments/companies/units in China, or formal Invitation Letter issued by renowned and creditable companies/units in China.
4. Visa recommendation letter from your employing company, organization, etc.
5. Other additional documents required according to the merits of each applicant, e.g. bank statements, round-trip air tickets booking, etc.