In this paper, the viscous fingering instability in miscible Newtonian fluid displacements is studied experimentally. Studying the results of this instability have widely application in oil extraction from ground bed oil reservoirs to the ground surface. In order to be more actualized results, a porous media with transparent walls and compact structure of spherical glass beads is constructed, that have close permeability to ground bed. The main purpose of this study is to investigate the effects of viscosity ratio, flow rate and Blake dimensionless number on the quality of growth and the shape of the fingers, also their effect on important physical parameters including the mixing length, sweep efficiency and noise growth to base state. The results showed that with increasing the viscosity ratio, instability and number of finger branches increases and more tiny fingers are formed. Also, increasing the viscosity ratio increases the mixing length and decreases the sweep efficiency. Likewise, with increasing the flow rate, it was observed that the number of wide fingers Increased and fingertips tend to spread. Furthermore, by studying the results it was found that increasing the flow rate, increases the sweep efficiency, but have No tangible effect on the mixing length. Also, the results show that increasing the Blake decreases the mixing length and increases the sweep efficiency.