Options you can choose to send parcels and their respective features.
China mail: China mail is available in any China post office and usually is the cheapest way to send a any parcel. This kind of mail is not so widely used than the China EMS and you need to be aware that do not use the surface mail as it has no guarantee. Many old Chinese people like to use this kind of mail to send letters to their friends as they are used to do. For most students who are come from a remote area, use it to send books, boxes, daily use articles to their hometown is also a cheap and convenient way.
China EMS: China EMS is often used by online e-commerce sellers to ship international goods to their buyers. Within China, there is not many people use this kind service. Instead, they usually choose Shunfeng and other private companies.
Private Companies: Apart from Shunfeng, the most popular private couriers in China are called "四通一达". They are ZTO Express, STO Express, YTO Express, Best Express and Yunda Express. Many enterprises, be it small, medium or large, usually have cooperation with Shunfeng to send their items as it provides the best on-time delivery services. However, many online sellers and ordinary people like to use "四通一达" companies to ship items as it has very low shipping fee and almost every street has it dropping places including those convenient stores.
International Couriers: International couriers like DHL, FedEx and UPS also provide shipping services within China as they have subsidiaries located in China. The staff there can speak English, most of the time, they can help you fill out the form and you do not need to worry that you will have problems in communicating if your English is poor. But the shipping fee there are 5-10 times higher than that of Shunfeng. Besides, you can only find them in the first-tier city like Beijing, Shanghai, Guangzhou and so on. Therefore, the shipping fee may not be a problem for you.