Phase separation of alkaline gelatin in water-acid solutions in the presence of low etherified pectin (ED 38%) were investigated. The effects of the pectin weight fraction in pectin/gelatin mixture (q(o)) as well as two conditions of complex formation, namely, mixing of the binary biopolymer-solvent systems at pH 3.5 ('mixing conditions'), or preparation of the ternary gelatin-pectin-water systems at pH 7.5 and their subsequent acidification up to pH 3.5 ('titration conditions'), on phase equilibrium and macrostructure of the concentrated complex phase were established using phase analysis, and optical microscopy. At q(o)< 0.5 the aggregative phase separation was observed in both conditions of complex formation leading to the almost complete concentration of both biopolymers in the bottom phase at q(o)=0.3 ('mixing conditions') and at q(o)=0.5 ('titration conditions'). At q(o)> 0.5 unusual three phase separation took place in the 'mixing conditions', leading to formation of supernatant (phase 1), complex coacervate (phase 2) and concentrated pectin solution (phase 3). Possible mechanism of such phenomenon was discussed in term of segregative and aggregative phase separations.