Abstract: Based on actualities of research and progress in digital pipelines，objective in digital construction for in-service pipelines and its theoretical system are put forward．Kernelled database to be adopted in digital construction for in-service pipelines is described from the facets of data’s economic evaluation．data classification & acquisition，data management and model data analysis．Procedure to establish database of digital pipelines is given where classification of acquired data and data volume are determined according to the demand of digital pipeline construction for data and economic evaluation results of data acquisition, and then, through effective management and analysis on the data to realize data's effective utilization，database establishment for digital pipeline is completed．Integrity management model．pipeline system simulation model, pipeline maintenance & scheduling model and pipeline emergency repair model are investigated，combined with research actualities in digital pipeline models at home and abroad aiming at improving pipeline operation & management model，increasing economic value for data acquired to finally realize modeling．automation and intelligentizing management of oil & gas pipelines．