The incorporation of silver in DyBCO ceramics was studied by EDX in TEM and correlated with the superconducting properties through R - T, I - V characteristics and critical current as a function of an external magnetic field. Two types of doping were performed: addition (A samples) and substitution (S samples) for . It was observed that for A samples, increases by K and is improved by a factor of 2. The influence of the applied field upon decreases slightly with x for A samples but the weak link behaviour remains. It was shown that silver does not enter in the 123 lattice. It slightly segregates at grain boundaries maintaining narrow junctions which are likely improve the coupling between grains, explaining the observed increase in . On the contrary, for S samples, is unchanged and the transition is wider. The effect of the magnetic field on increases with the doping level. Silver is found in the lattice, but the concentration is always lower than the nominal one and is limited to 0.12 for x = 0.4. This limited solubility leads to a deficiency in copper and consequently to noticeable ratio of second phases. Furthermore, a high segregation was observed at grain boundaries. This specific microstructure which produces wider junctions explains the decrease in .