Follow the steps above. Close iTunes when finished, power down the iPod completely, but keep it connected to your computer. These steps are for iOS 5.1.1. Absinthe is one of the easiest to use programs for iOS 5.1.1 jailbreaking. Version 2.0.4 will allow you to perform an untethered jailbreak, which means you won’t have to connect your iPod to your computer to turn it on after jailbreaking. They also offer a 5.01 jailbreak that follows the same steps. Pay attention to any onscreen instructions that you may need to complete to get your iPod into a DFU (Device Firmware Update) state. You may need to click “Jailbreak” again. While the device is off, hold the Power button for 3 seconds. After 3 seconds, continue holding the Power button and hold the Home button for 10 seconds. After 10 seconds, release the Power button while continuing to hold the Home button for an additional 20 seconds. A message should appear in iTunes letting you know that you have entered DFU mode. The iPod will automatically reboot. This will download and install Cydia. Cydia will be used to find and install apps that aren't normally permitted on Apple devices. Check out our  guide on using Cydia to get started. After this, your iPod Touch is jailbroken and can be used tethered. To turn your jailbreak into a fully untethered jailbreak, you will need to download Rocky Raccoon from Cydia. This will allow you to turn your device on without needing a connection to your computer.

TL;DR in Chinese:
备份设备。 下载 Absinthe 2，这是一款免费的越狱固件。 然后设备会自动开始越狱。 将iPod设定进入DFU模式。 等一小会，就会看到“Complete”（完成）信息了。 打开主画面中的“Loader”app。 再重启一次iPod。 进行完美越狱。