Arsenic pollution of soils has been an issue of concern the world over, including China, and bioremediation of arsenic polluted soil a hot spot of research. However, related mechanisms of the bioremediation are not yet fully understood. A review is presented of recent advancements in the study the world over on mechanism of microbiomes, earthworms and plants assimilating and detoxifying arsenic, and lab experiments on remediation of arsenic-polluted soil with a complex microbiome-plant system in this paper. At present, it is generally deemed that the technology of plant remedying soils polluted by heavy metal/metalloid has a bright prospect of application, however, it has demonstrated a number of shortcomings even if it is limited to or uses the single function of hyperaccumulating plants. If microbiological technologies and earthworms are used in addition to regulate micro-ecology of the rizosphere, so as to facilitate survival and/or absorption of As, the technology will further broaden its prospect of application in the future.