One of the challenges in microrobotics is to find suitable and simplistic ways to swim in low Reynolds number.For such work,magnetically controlled achiral microswimmers with the simplest possible body structures were shown to swim in low Reynolds number environment.Most previous works on artificial microswimmers had always focused on using chiral or flexible structures to generate non-reciprocal swimming motions in low Reynolds numbers; this inevitably brings complicity to the swimmers shapes and structures.However,an achiral and rigid structure can swim under the proper conditions,as demonstrated by this work.An achiral microswimmer consists of three magnetic micro-particles conjugated through avidinbiotin chemistry and magnetic self-assembly.A magnetic control system of approximate Helmholtz coils was used to control the microswimmers.Both directional and velocity control were successfully implemented to navigate the swimmers through low Reynolds number environment.Furthermore,multirobot manipulation,modular robot control,and PIV characterization had been employed.The implication of the swimming phenomenon and the robust control demonstrated herein serves as great potential to revision future developments of microrobots,especially for therapeutic targeting and minimally invasive surgical procedures.