Chu Jiang Wang, or King Chu Jiang, resides in the Second Court of Di Yu (地狱 dì yù), where he passes judgement on the souls (魂 hún) that are brought to his domain.
The Second Court of Di Yu is located under the Wo Jiao Stone (沃焦石 wò jiāo shí) that marks true south, which in-turn is located at the bottom of the Great Sea. The Second Court is said to be 800 leagues long and wide, and has 16 additional "sub" Di Yu.
As the Yama of the Second Court, Chu Jiang Wang passes judgement on souls that have been sent to him by Qin Guang Wang (秦广王 qín guǎng wáng). These souls will have committed crimes of the following nature in their previous life on Earth - also known as the Yang Realm (阳间 yáng jiān):
Cause disaster(s) by deceiving the public and obtructing the law, abusing power to take advantage of people, cursing people, plotting to take someone's land or property, abducting children, forcing good people into prostitution, forming criminal gangs, dealing drugs, stealing from the people, extortion through gambling, illegal marriage, counterfeiting, selling counterfeit drugs, disrupting order, endangering health, etc.
Depending on the severity of each individual crime they committed, the soul will go through 1, many, or all of the 16 sub Di Yu that reside within the Second Court. Each of the 16 Di Yu are named after the torture method that is used within. The souls are tortured in each sub Di Yu for a period of time that the Yama judges to be necessary. Should they "die" during the process, or if they lose a limb for example, the soul will be "repaired" or "resurrected" again for the next round. And so on, and so forth.