The utility model discloses a frock is born in semiconductor device's backward flow, include the sole piece of fixing with reflow oven track direct contact, the fore -set that is used for loading the half -finished carrier of power module and is used for being connected sole piece and carrier, wherein, setting up two at least boat on the carrier and bearing the position, each boat bears the position and sets up at least power module semi -manufactured goods and place the position, and the width of sole piece is unanimous with reflow oven railway width. The utility model discloses can arrange in an original backward flow boat's position sets up a plurality of boat and bears the position, and backward flow efficiency improves, guarantees that equipment around the reflow oven, track are unchangeable to under the good prerequisite of backward flow welding process, promote reflow oven's productivity efficiency greatly.