Experimental research was carried out to investigate the characteristics of the effervescent type twin-fluid spray nozzle with circular and elliptical exit orifice. After fixing the liquid flow rate, while controlling the air flow rate was observed such as flow rate and pressure inside nozzle, spray image. Also, discharge coefficient of the pressure-type equation and Jedelsky`s equation are calculated and compared these values and found to be greater about 3-4 times the Jedelsky`s equation. Nozzle pressure was proved according to the ALR, E2 is higher than E1 and E2 SMD was also observed smaller than E1 SMD. It is expected that the differences caused by the discharge coefficient value.