Abstract: Based on experiments author performed and theories concerned, this paper analyses emphatically the errors probably resulted from the real-time holometry(RTH) for the tunnel flow visualization and shows the way how to determine and to correct them. It has been shown practically that RTH, fitted with suitable light source and visualizing/recording system, enables hologram to be reconstructed directly and to be visualized even adjustable/controllable in the testing ground and, excuses experiments from blindness and lots of follow-up processes. In addition, RTH selects flexibly the interference terms and so is of particular advantage to other optical methods which are very hard to be used either in real-time inspecting/visulizing or in diagnosis researching of the twinkling and progressing states of hightemperature dense plasma with strong raeiation.After all,provided the test device elements have not considerably shifted over-dampingly and plastically,RTH is an effective and reliable technique for tunnel test.