An adaptive positioning method for auto-correlation sequence includes the follows: using input signal storage to store received signal sequence, carrying on correlation to known adaptive sequence and received sequence by a correlator, shifting suceessively to obtain a sequence of correlative values and keeping this sequence in storage of correlative value sequence, controlling width of search window by search window controller to carry on certainty judgement and storing the searched result as it to be output by a controller, a correlative peak searcher to search the maximun and the secondary correlative peaks in correlative value sequence kept by correlative value sequence storage according to the search window width given by search window controller. |