Abstract: Technical features of horizontal well development aredescribed in respects of horizontal well selection criteria,production capacity and influential factors, seepage flowcharacteristics and pressure distribution. Comparativeanalysis are performed about vertical well developmentfeatures and horizontal well development status and initialdevelopment regularities of the low - porosity andlow - permeability layer Ⅲ 1 in Baobci block, Baolangoilfield. Prediction of horizontal well development featuresin late stage and economic evaluation are performed byusing numerical simulation and experimental formula andeconomic evaluation software. Detail measures are alsoput forward to solve the problems occurred in horizontalwell H2 and H3 development.