Point-line meshing gear is a new-styled gear characterized by both easy manufacturing and divisibility of involute gears and high strength for contacting between convex and concave tooth profiles of a circular-arc gear. And contact strength of point-line meshing gears has improved by 1~2 times in comparison with involute gears, and bending strength of such gears has improved by approximately 15%, while noise has decreased even by 5～10dB (A). In addition, with the increase of load, noise will decrease by 3~4 dB (A). Only a few teeth or even 2~3 teeth are required for a pinion gear. There are single point-line meshing gears (equivalent to single arc gear), double point-line meshing gears (equivalent to double arc gear) and few-tooth point-line meshing gears, totaling three kinds, which are widely used in reducers for metallurgy, mining, craning, transport and chemical industries. And the three kinds of gears can be converted into soft tooth-flank, medium tooth-flank and hard tooth-flank gears. Here the types, characters, meshing features and dimension calculation of point-line meshing gears are described.