The invention discloses a technology for pipeline assembly. The technology for the pipeline assembly comprises the following steps that firstly, the distance from a base point to a pipeline assembly opening is read at a proper position of the pipeline assembly opening, the position of the base point is drawn, then a plurality of quadrantal points are found out and drawn up at the outer wall of theend face of a pipe opening of an assembled piece, and the quadrantal points serve as measuring points; secondly, the distances A from the base point to the measuring points are calculated; thirdly, the distance from a first measuring point arranged on the assembled piece to the base point is measured and adjusted, the distance is equal to the distance A from the base point to the assembly opening, then whether the data of the distance from the base point to a second measuring point is equal to the data of the distance from the base point to a third measuring point or not is compared, if not,the angle of the assembled piece is adjusted until the data of the distance from the second measuring point to the base point is equal to the data of the distance from the third measuring point to thebase point; and fourthly, the assembled piece and a pipeline are positioned, and the assembly of the pipeline and the assembled piece is completed. According to the technology for the pipeline assembly, the size of the pipeline when the pipeline is assembled can be controlled; and moreover, the assembly speed of the pipeline is increased, and the assembly quality of the pipeline is improved.