近年來隨著無線網路的發展下,各種定位技術也隨之進步。因此在眾多定位技術下,利用現有的架構進行定位已經成為熱門的研究項目。目前的定位技術有許多的缺點,如複雜的計算或離線的量測等等。在本論文,我們僅利用可視之存取點所形成之集合的變化,分析其前後關係,利用簡易經驗法則進行預測點的修正,經過我們的實驗結果證實,該修正方法並搭配系統的最佳化參數,可確實達成基本的定位。;As development of wireless networks advance, a variety of positioning technologies have been proposed. The positioning technology using existing infrastructure for positioning has become the most attractive research topic. The current positioning technologies have many disadvantages, such as complicated estimation, calculation and offline measurements. In order to solve the above problems, this thesis proposes the simple indoor positioning system, which uses the existing wireless network and estimates the location according to the variance of the sets of discovered access points. Our experimental results confirmed that the simple estimation method is able to measure the locations of users.