To manipulate untethered microrobots the EMA system has to be designed properly to provide sufficient propulsion with respect to application objectives. Great care must be taken in developing an efficient EMA setup, with sufficient degrees of freedom (DOF) and without singularity. Hence, the magnetic microrobotic system must be further investigated to be able to fully comprehend either their capabilities or limitations. Both specifications of the applications and the general design of EMA systems will be comprehensively discussed and analyzed in terms of requirements on the number of electromagnets used, the size of the workspace, the number of degrees of freedom for the locomotion, the manipulability of the control, the unexpected singularities, system stabilization, etc. Therefore, through the similar investigation in the characteristics of the application, the suitable EMA microrobotic system can be designed with respect to the desired movement task with given type of the microrobot.