What are the reasons and types of crime avoidance?

The reasons and types of criminal challenge are: 1, being a close relative of a party or a party or agent in this case; 2. The object of avoidance has an interest in the case; 3. Having served as a witness, expert witness, defender, inspector or agent ad litem in this case; 4. The object of withdrawal has other relations with the parties to the case, which may affect the fair handling of the case; 5. Accepting the invitation of the parties, giving gifts or meeting the parties or agents ad litem in violation of regulations.