Abstract: The exchange bias and coercivity of FM/AFM bilayers and FM/AFM mixed monolayers with nonmagnetic dilution are studied in a Monte Carlo model.It shows that the exchange bias increases and then decreases with the increasing of dilution concentration while the coercivity decreases and then increases. With the same dilution concentration, both the exchange bias and the coercivity of the regular dilution are stonger than those of random dilution in FM/AFM bilayers.But in the mixed monolayer,the exchange bias of regular dilution is weaker than that of random dilution while the coercivity becomes stronger.Regular dilution results asymmetry in the hysteresis loops distinctly.It shows that the asymmetry of hysteresis loops in FM/AFM systems depends on the interface microstructure.

Key words: Monte Carlo method, FM/AFM system, exchange bias and coercivity