For recognizing and extracting useful information in infrared image,infrared system usually processes the collected data by different algorithms. With the continuous development of infrared technology,many kinds of image processing algorithms have been developed. Except conventional image processing algorithms,pseudo-color coding is usually adopted for improving the eye recognizing ability to infrared image. For selecting the optimal infrared image processing algorithm in practical application,testing system of infrared image processing algorithm based on FPGA is designed and it is a useful tool to evaluate various algorithms. Common infrared related and self-defined algorithms for testing pseudo-color coding are integrated in the system,and display terminal is used to verify infrared data in real-time. Through testing experiment of rainbow coding,hot-metal coding as well as image sharpening algorithm,the practicality of the testing system is demonstrated.