Oscillating behavior of working gas inside a basic pulse tube refrigerator as well as an orifice pulse tube refrigerator are investigated in the range of frequency from 1 to 10 Hz. Difference in gasdynamic behavior of working gas between both types of pulse tube refrigerators is discussed. Pressure and temperature oscillations are measured at various points. A wall temperature distribution along the tube and the heat extracted from the hot end are also obtained. An oscillation behavior of gas pressure is quite similar at all positions through a pulse tube for both types. However, that of gas temperature changes with locations along pulse tubes. An amplitude of temperature oscillation at the hot end is larger than that at the cold end for both types. A phase of temperature oscillations as compared to pressure oscillations shifts backward for the basic pulse tube, but the reverse is observed for the orifice pulse tube.