The utility model relates to an instrument for orientation by backsight and measuring and sampling. Including pole setting and be used for supporting two down tubes of pole setting, the top of down tube links to each other through first connecting piece and pole setting, still is equipped with between down tube and the pole setting and is connected vaulting pole between them horizontal, and the one end of horizontal vaulting pole is passed through the second connecting piece and is linked to each other with the pole setting, and it is continuous with the down tube that the other end of horizontal vaulting pole passes through the third connecting piece, and first connecting piece, the position of second connecting piece in the pole setting is adjustable, and the position of third connectingpiece on the down tube is adjustable, pole setting and two stable triangular supports points of down tubes formation. Can know by above -mentioned technical scheme, the utility model discloses a butit is continuous with the down tube to set up the cloud platform of multi -angle free rotation in the pole setting, sets up the horizontal vaulting pole of adjustable position between pole setting anddown tube, has constituted stable triangle -shaped structure, the utility model discloses convenient operation, durable, sexual valence relative altitude have ensured the precision of surveying and drawing the operation simultaneously, have widened the operation space, have reduced the risk of survey and drawing operation.