The positioning method of TDOA (Time Differences of Arrival) is applied to the positioning of aircraft in deck landing.Several major kinds of TDOA algorithms are analyzedand the Spherical Intersection (SX) algorithm is chosen based on the practical situation and the limits of shipboard aircraft landing.Considering that SX algorithm has large computation burdenthe equation coefficient matrix may be illconditioned and so onwe propose an algorithm based on linearization equation.By adding a range difference equation on the foundation of SX algorithmthe nonlinear equation is transformed into a linear equation.The simulation results indicate that : compared with SX algorithmthis algorithm has higher accuracy and smaller computation burden.