There are many shipping/courier companies in China. Basically, they can be divided into logistics and express shipping. The former one is usually for shipping very big/heavy items above 20kgs with lower cost, but usually not able to deliver to your door except you pay them more. The latter one is usually for small items under 20kgs with higher cost, but they can deliver to your door without extra fee.

Most TaoBao.com and Tmall sellers are using the express shipping as most items sold online are small items, except those big ones like fridges, furnitures. Most of sellers ship with the following express shipping companies:
韵达快递,
天天快递,
申通快递,
圆通速递,
德邦速运,
百世汇通,
顺丰速运,

中通速递.

There are even more.

Different shipping companies are of different speed and price. The shipping process usually takes 3-5 days to get delivered, depending on the shipping company and the distance between the seller and the receiver. The shipping price is usually of 6-12CNY for the first kilo and 4-8CNY for every additional kilo. If the item size is big but light, shipping company will also convert the volume to volumetric weight and calculate the shipping cost based on the volumetric weight instead of the real weight.

Be Aware: Usually most sellers don't ship to remote districts because of the shipping cost and timing. And even most of these express shipping companies are not reaching to remote districts.  The following provinces belong to the remote districts: XinJiang Province, Tibet Province, Inner Mongolia Province, Qinghai Province, Ningxia Province.