Rheological properties of xanthan gum, guar gum and xanthan/guar blends has been investigated. Maximum synergism was observed at blend ratios 1:1 in absence ions. Addition of sodium ions above level 0,005 M. diminishes the interactions significantly. Xanthan/guar gum blends had thixotropic properties. The highest thixotropy coefficient K_T = 2,6 was observed for xanthan gum : guar gum blend (3:7) in absence ions.