Abstract: Faking virtual fish as an example, the paper presented an algorithm with critical technical points on virtual lives' food hunting behavior and escaping in three-dimensional environment. The core algorithm were researched which can search automatically, detect food, predict self-behavior and adjust searching direction after an enemy or food is locked down with the precondition of maintaining self-balance. Results of simulation were presented to prove the effectiveness of the series of algorithms.

Key words: Virtual life, Artificial intelligence, Self-balance, Hunting, Escaping