Abstract: Several large-scale pipeline construction projects such as Central Asia gas pipeline, West Oil & Products Oil Pipeline, Dalian Xingang-Dalian Petrochemical Oil Pipeline that have adopted the parallel laying technology is introduced. Based on existing standards and codes, some scholars have discussed the determination principle in the parallel laying spacing of oil & gas pipelines from the point of view of engineering, economic, safety, and design respectively. And by using numerical simulation methods, other scholars have analyzed the thermal influence law between products oil pipeline vs hot oil pipeline laid in one ditch. And other engineering and technical personnel have done some useful exploration on the construction process of parallel laying technology based on existed problems in corrosion protection and maintenance, etc. There are some new topics to be solved in the technology field of parallel pipeline laying, such as the various influence factors in the spacing between parallel pipelines, laying gas pipeline and oil pipeline, gas pipeline and gas pipeline in one ditch, and the optimization of the process system and station laying out for the pipelines laid with parallel method.