The aim of conducted research was to determine in what degree inoculation of soil by fungi Trichoderma modifies process of phytoavailability of cadmium through roots and above ground parts of maize (Zea mays) and how it affects cadmium activity as damaging factor of photosynthetic apparatus of plants. Outline of vase experiment covered 5 objects (control without addition of cadmium and 4 objects with increasing amount of cadmium in amount from 10 to 80 mg.kg-1 d.m. soil), and within each object two variants: soil without (-T) and with (+T) addition of fungi of Trichoderma (+T) in shape of granulated preparation of Trianum–G in amount of 750 g.m-3 soil. Increasing amount of cadmium in surface caused decrease of harvest size of roots and above ground parts of maize, but inoculation of surface by Trichoderma fungi softened those changes. Amount of cadmium in plants was increasing promotionally to increasing amount of that metal in soil, but the presence of fungi of Trichoderma type caused decrease of phytoavailability cadmium by above ground parts of maize. Decrease parameters of chlorophyll fluorescence F0, FM, Fv, Fv/FM Fv/F0 showed lack of disturbances in photosynthetic apparatus of maize despite decrease the amount of chlorophyll in leaves under the influence of inserted cadmium doses to soil.