Abstract: A connecting assembly for horizontal boards and wall boards of a cabinet. Each of the horizontal boards and wall boards is formed with clamping channels along lateral sides. The connecting assembly comprises upper T-blocks, lateral T-blocks, inner cross-blocks and L-shaped corner blocks each of which is formed by a vertical slat and at least one horizontal slat. One edge of the vertical slat is formed with shallow or deep dovetail notches at equal intervals. The dovetail notches have reversely inclined faces which are interlaced, or have inclined faces. The horizontal slat has corresponding dovetail tenons spaced from each other by a distance equal to or double that of the dovetail notches.

Abstract: A cabinet wall board assembly including a horizontal board, a wall board and multiple adjoining members. The horizontal board is formed with a connecting channel and each adjoining member has a first end for inserting into the connecting channel, a second end disposed with multiple equally spaced tenons and an engaging face under the tenons. Each tenon has an arch bottom. The wall board has an upper end disposed with multiple dovetail mortises corresponding to the tenons of the adjoining member and has a supporting face on inner side of the dovetail mortises for engaging with the engaging face of the adjoining member. The horizontal board is associated with the wall board with the tenons inserted in the mortises and the engaging face supported by the supporting face so that the horizontal board is reinforced to bear heavier load. In a working site, the horizontal board and the wall board can be easily and quickly assembled into the cabinet.