This invention is one kind has the fast detection object position installment and the method, specially one kind can apply mechanically directly in each kind of phantom system carries on the object position the detection installment and the method. This invention is mainly to wants through the phantom system according to the user to detect the direction the region to carry on the phantom to pick up, designates as well as the object identification method again by the image process unit through the scene area phantom judges the object the position and the related information. This invention uses the phantom data processing method is one kind transforms the two-dimensional phantom material to be apart from the off-axis the univariate signal information, but the object identification is judges by one kind the univariate signal information using the numerical differentiation estimate way the object the position, then the univariate signal information differential value carries on the object to continuous input's neighboring two phantoms to approach the condition again the judgment. The calculating method needs the operand to be small, portable is good.