The present invention relates to a gear type mechanical transmission, which is applied to shift speed in a vehicle or mechanism drive. The gears of the multi-stage transmission connected in series in the invention are divided several shift speed stages, and each has direct speed and shift speed. Three pairs of gears compose two-stage shift having four-speed, four pairs compose three-stage shift having eight-speed, and five pairs compose four-stage shift having sixteen-speed. The conventional five-speed shift needs five pairs of gears and has complicated construction. Multi-stage transmission connected in series could also compose conical gearr, planetary gear, and so on, which is simpler than existing congener transmission. In the existing planetary gear system of automatic transmission having four-speed, 6∩8 clutches, brakes, and two kinds of controller for shifting are needed. In present invention, the planetary transmission having eight-speed needs only 5∩6 said components.
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