From Fig. 2 a it can be seen that temperature did not have significant influence on the extraction yield. Eggers (1996) and Salgın et al., 2006 reported that the increase in the extraction yield as a function of increasing temperature, at a constant pressure, were recorded only at the value of pressure of 400 bar and at higher pressures. Furthermore, during the analysis of pressure impact on extraction yield (Fig. 2b) the temperature and solvent flow rate has been maintained constant. As expected, the yield of hemp seed oil increased with the increase in extraction pressure, in a manner to seed oil solubility. At a pressure lower than 300 bar the seed oil have a very low solubility, while by increasing of pressure up to 700 bar solubility increased significantly (King, 1997). The similar results related to extraction pressure effect of hemp seed oil extraction curves were found in study published by Da Porto et al.(2012b). They published that with increasing pressure increase thetotal obtained oil.