The binding of fluorine, bromine or iodine atom to small neutral, anionic or cationic silver clusters Ag_n^0,±1 (n＝2～7) has been studied by using the PW91PW91 density functional method. The binding energy, binding pattern, electronic structure and dissociation channel have been explored, in comparison with the previous study of chlorine binding to silver clusters. Calculations show that the most stable structures of complexes, Ag_nX^0,±1 (X＝F, Br and I) and Ag_nCl^0,±1, often have similar structures and binding patterns. The binding energy and electron transfer ability are in the order F＞Cl＞Br＞I, which is consistent to the electronegativity order.

Key words: density-functional theory, silver cluster, halogen atom