Abstract: Wireless sensor networks localization method based on the signal strength indication is one of important practical localization methods. A novel one dimension localization method based on empirical and mathematical model is proposed with Hash table RSSI data, according to the road monitoring, pipe transportation and transmission line applications. Compared with the RADAR and 1-DEMRSSI methods, with almost same computation, the proposed method improves the localization accuracy. Under the situation with the less reference test points, the accuracy increases about 60%, on the other hand the accuracy increase 5%-10% with more reference test points. According the same accuracy, the proposed method greatly reduced the quantity of the reference nodes. Key words: Wireless sensor networks; localization algorithm; continuous localization; Hash table