On the basis of research on the application of image matching technique, the heavy-inter- ference image matching especially the real-time filtering technique suffered from the smog interference ef- fects is addressed.The smog interference makes the real-time image fuzzy,which causes the image matc- hing system unperform well or brings error-match worse. Firstly, the smog interferences′ effects on the image matching system especially on the real-time filtering is analyzed,also including the main parameters of the smog interference model and the fundamental design for filter realization. Then the related filter al- gorithm is proposed on the basis of the analyses above and the simulation filter is performed using Mat- lab.The results indicate that this algorithm can eliminate the smog noise sufficiently,and improve the quality of the real-time image under smog interference effectively,which also provide more design meth- ods for the technique of the real-time filter under the smog interference.