Bisdioxopiperazine (Biz) compounds, including ICRF-154 and razoxane (ICRF-159, Raz), are anticancer agents developed in the UK specifically targeting tumor metastases. Further three bisdioxopiperazine derivatives, bimolane (Bim), probimane (Pro) and MST- 16, have been synthesized at the Shanghai Institute of Materia Medica, Chinese Academy of Sciences, PR China after 1980. Since metastases, the prevailing deadliest pathologic feature of cancer in clinics, have been the main obstacle in cancer therapy, antimetastatic effects and mechanisms of Biz compounds are interesting and significant topics of all time for researchers undergoing the investigations of metastases biology, treatments and patho-physiology. This review addresses and highlights the different inhibitions against metastases in vivo and molecular mechanisms in vitro of Biz compounds especially relating to the inhibitions of tumor metastasis including pathways of inhibitions against angiogenesis, topoisomerase II, calmodulin, sialic acid, fibrinogen, cell-movement and so on. We argue hererin that the systematic exploration of antimetastatic activity and mechanisms of Biz compounds seems to be a shortcut for a final solution of cancer therapy in the future.