The toroidal drive combines rolling contact technique with planet worm drive. The drive has many advantages such as high carrying capacity, large speed ratio, high operating efficiency and low noise. It is the frontier in the mechanical drive field. The paper reviews the origin and present study conditions of the drive. The present problems for the drive are also analyzed. The authors think that the engaging theory, manufacturing technique and the carrying capacity for the drive should be further studied so that a set of synthetic design theory and manufacturing technique can be developed and the rationalization of design and manufacture process is realized.