I am in Yangon, Myanmar. I'd like to reissue my passport as no pages left.

Ling, you need to prepare these documents and submit them to the embassy in person. It takes 15 working days to deal with your application. The fee is 35 USD and you need to pay in cash. The required documents are:
1 filled application form for applying Chinese passport/travel document
2. 3 recently taken passport photo in white background.
3. original passport and copy version
4. Foreigner Registration Certificate, original and copy versions
5. Household Registration Book,original and copy versions (if you have)