In prosthodontics,it has been a long time since the western countries developed various at -tachments to replace traditional clip .In order to realize the nationalization of the attchments for prosthodontics,a series of research work should be carried out .The first task is to select astructure according to clinical requirements and make mechanical analysis and strength ofthe attachments.Here is introduced simplified mechanical model,and how the finite element stress analysis and strength test was carri...