A series of homoisoflavonoid derivatives was designed, synthesized and evaluated as potential multi-functional anti-Alzheimer's agents for their inhibitory activity on cholinesterase and monoamine oxidase. Among them, compound <b>16</b> showed moderate acetylcholinesterase (AChE) inhibitory activity (eeAChE IC<sub>50</sub> = 0.89 ± 0.02 μM; hAChE IC<sub>50</sub> = 0.657 ± 0.002 μM) and significant monoamine oxidase B (MAO-B) inhibitory activity (hMAO-B IC<sub>50</sub> = 0.0372 ± 0.0002 μM). Kinetic analysis of AChE, MAO-B inhibition and molecular modeling studies revealed that compound <b>16</b> is a dual binding site inhibitor of AChE and noncompetitive inhibitor of MAO-B. Furthermore, <b>16</b> could penetrate through the blood-brain barrier (BBB) <i>in vitro</i>. Most importantly, oral administration of <b>16</b> demonstrated no marked signs of acute toxicity and it could significantly reverse scopolamine-induced memory impairment in mice. These results suggested that compound <b>16</b> is a promising multifunctional drug candidate with potential effect for the treatment of Alzheimer's disease.