Abstract: In wireless sensor networks, the node self-localization is vital and promising to a wide scope of both military and civilian applications. In this respect there are two types of algorithms, i.e. range-based and range-irrelevant, either has its own advantages and disadvantages. Taking account of those of the two algorithms, a low-cost and practical algorithm is proposed, using RSSI (received signal strength indicator) for range measurement between nodes and propagating the cumulative range in meter in a multijetter network, then localizing nodes geometrically via maximum likelihood estimation. Simulation results showed that by the algorithm the average error is 10%, while the position error is about 20% of nodes' RF transmission range if the ratio of anchor nodes is 10%.