It's an important and complicated process in target interpretation that target features extraction and identification, which
effect psychosensorial quantity of interpretation person to target infrared image directly, and decide target viability
finally. Using statistical decision theory and psychology principle, designing four psychophysical experiment, the
interpretation model of the infrared target is established. The model can get target detection probability by calculating
four features similarity degree between target region and background region, which were plotted out on the infrared
image. With the verification of a great deal target interpretation in practice, the model can simulate target interpretation
and detection process effectively, get the result of target interpretation impersonality, which can provide technique
support for target extraction, identification and decision-making.