1. He need a F Business visa for his training in Chengdu, China.
2. A china F visa is ok bth or his stop in Beijing and his training in Chengdu.
3. the required documents are: his passport with blank pages and at least 6 months validity left before expiration; a truly and completely filled application form affixed with one passport-sized photo; a Visa Notification Form issued by Chinese authorized unit (if he come to China for training, he should has such document from the training school or other unit);round-trip air ticket and hotel reservation.
4. The photo must be a recent 2-inch, half-length, bareheaded and full-faced light blue and white background photo;
5. He'd better go to the embassy in person or he may entrust someone else or a travel/visa agent to the visa office of the Chinese Embassy on behalf.