The traditional methods of designing four-bar linkages with intermittent motion is usually quiet complicated.

This paper expounds that the driven link of four bar linkages with special link length relationships has the motion property of long dwell period and points out that this kind of four bar linkages has many practical values in engineering.

Planar metamorphic mechanisms for reciprocating movements with dwells are put forward and the methods of kinematic synthesis of this kind of mechanisms are given.

Through testing the relation between impulse width, cease time, discharge voltage, discharge time and pasteurization effect has been explored.

From the mathematic character of an one ordered derivative of a compound function equals to zero which leads to the two and three ordered derivatives equal to zero on its corresponding points, the designing principle of a kind of combined mechanism doing high ordered intermission at limit positions was put forward.