Caterpillars don't need to be housed in anything too fancy - a clean one-gallon jar or a small fish tank is perfect.  These will be easy to clean and will allow you to see your caterpillar easily.  Cover the container with a piece of cheesecloth or mesh and secure with a rubber band. This will allow proper ventilation. Don't just poke holes in a screw-on lid (as some sites advise) as the caterpillars may attempt to escape through these holes and injure themselves on the sharp edges. If you're housing more than one caterpillar, just make sure that each caterpillar has around three times it's body size in extra space to move around in.  This will prevent overcrowding. It's a good idea to line the bottom of your caterpillar's home with some paper towel or tissue paper. This will soak up any excess moisture and catch any caterpillar droppings (known as frass). You can then easily clean the container by whipping out the dirty paper and replacing it with fresh stuff.  However, you should only line your caterpillar container with paper towels if you know that you have a species of caterpillar which pupates above ground. If you have a species of caterpillar which pupates underground (or if you're not sure what species it is) you should line the bottom of the container with a two-inch layer of soil or sand. This way, the caterpillar has something to bury into. The soil or sand should be slightly damp - but not damp enough that it causes condensation on the sides of the container. Caterpillars are quite sensitive to humidity. It's a good idea to place a couple of sticks inside the caterpillars home, for a number of reasons:  Firstly, the caterpillar will have something to climb on, which it may need to do in order to reach it's food. Secondly, the caterpillar may choose to pupate hanging from the stick. As a result, you should make sure that the stick is in a secure position and not in danger of falling over. Thirdly, once the butterfly or moth emerges from the pupa it will need somewhere to hang upside down in order...

TL;DR in Chinese:
用一个合适的容器来装你的毛毛虫。 在容器底部放上纸巾或土 。 在容器中放一些棍子。 保持容器潮湿。