Predicting the performance of target acquisition of human-vision-based infrared imaging system is one research domain spanning multi-subject. From the point view of building model, the information processing mechanism of human eyes and the clutter metric are the critical factors for the development of the target acquisition model. The issues involved in the development of the model and the means of settlement are also introduced, while the improvement of the target acquisition model is also discussed. Finally, the concept of 'performance model' is explained, which lays a foundation for building targeting task performance model according to our own applying circumstances.