Abstract: Based on the analysis for the vision system of the existing automaton fish,an improved method is presented.First of all,the paper points out the disadvantages of the existed system,especially on the time of data processing,then discusses the possible improving approaches.According to the comparison and discrimination,we affirm that if the target information changed into infrared image we can greatly reduce the data processing time.After the comparison for the several main sensors, we can draw the conclusion that the infrared imaging sensor is the best choice.Then,we present an intelligent signal processing design for the fish,make a simulating test for the improved system.Compared with the old way,the new design witnesses an evident advantage.All in all,the improvement discusses in the paper can serve as a positive reference for the overall design for the automaton fish.