A simple system for studing low speed phenomena by using holographic interferometry has been developed in our lab. It can be used to analyze the real time interference fringes with the combination of a real time holographic interferometry and a camera with continue shooting function and a He Ne laser. A series holographic interferograms of combustion process of an solid rocket propellant sample and a series holographic interferograms of lighting an incandescent lamp by increasing the voltage of the lamp step were recorded successivelly by using this system. The higher rate of the success for the holographic recording and the higher contrast for the interference fringes have been obtained by this system. It can be used as a powerful approach for studing low-speed phnomena function.