Abstarct: The importance and specific application of liquid jets on mechanical engineering, aero space, mextalorgy and applied physics and chemistry together with new application on nano-technology and Micro Electro-Mechanical Systems show necessity of this object in modern technology and human life. Therefore, in this research, breakup of viscoelastic liquid jet was experimentally investigated with respect of introducing dimensionless parameters and the effect of each parameter on the breakup length and volume of the drop was studied. In order to capture the instability of the jet by growing ring oscillation at the surface of jet a high speed PCO. Dimax S with capable of capturing 4500 frxame per second was used and fixed at the proper distance from the liquid jet. Poly-Acrylamide was dissolved in water-glycerol mixture. The role of dimensionless parameters on the instability of viscoelastic liquid jet such as Elastic number, Bond number, viscosity ratio, capillary number and Weber number were experimentally investigated by using polymer solution with different Poly-Acrylamide concentration dissolving in the same water-glycerol mixture. Result indicates that the increase of Elastic number due to increase of polymer concentration leads to a delay in jet breakup. Bond number affect the volume of drop wich is formed during breakup. According to the result, the volume of the drop decrease as the Bond number increase. Viscosity ratio and weber number show the same influence on the beakup length as the Elastic number did. It was experimentally confirmed that the increase in viscosity ratio and Weber number result in increase of breakup length. The main purpose of this research was to study the viscoelastic jet instability behavior of surfactant. To achieve this purpose, sodium do-decyl benzene sulfanate was added to a polymer solution with concentration of 100ppm of Poly-Acrylamide. baxse on the result, using surfactant leads to an increase of breakup length.