Aiming at the problem of end force minimization of permanent magnet linear synchronous motor（PMLSM），an effectively method to weaken the end force by adding auxiliary iron core at the both ends of the primary iron core is proposed. Firstly, the mechanism of the end force and the electromagnetic force on the tooth wall are analyzed. When the height of the auxiliary iron core at both ends of the primary iron core is an air gap length, and the length is 1/4 permanent magnet pole distance, the end force has the minimum value. Taking a 36-slot/12-pole axial-magnetized tubular permanent magnet linear synchronous motor (TPMLSM) as an example, the finite element simulation analysis and experimental test are carried out. The finite element analysis value is in good agreement with the experimental value, which proves that the proposed method can effectively weaken the end force of PMLSM, and also provides a simple and effective method of the end force minimization for PMLSM.