Traditional linear switched reluctance motor always carries on undesirable characteristics from rotating switched reluctance motor,which include large thrust pulsation and prominent noise problem.When the operation of a linear motor is studied,the air gap magnetic field and the electromagnetic force should be calculated precisely.Because of the effect of the linear structure,the edge effect and the cogging effect,the equivalent magnetic circuit method can not satisfy the requirements.To optimize the performance of linear switched reluctance motor and calculate the electromagnetic parameters precisely,this paper improved and designed a type of linear permanent magnet switch reluctance motor,Schwarz-Christoffel transform method was used to derive the equations of its magnetic field,and the Maxwell stress tensor method was used to calculate the electromagnetic force that is based on the magnetic field.The results were compared with those calculated by finite element method,which proves that the results are correct and reliable with high precision.Schwarz-Christoffel transform method was proved to provide a reliable method for the design and analytical calculation of the linear motor.