The contrails produced by the aviation activities of jet aircraft in the upper troposphere can affect the regional climate and have a positive contribution to global warming.The radiative forcing of contrails is closely related to the regional coverage,physical properties and optical properties of contrails.This paper reviews the related research progress in line-shaped contrails in recent decades and summarizes different methods for line-shaped contrails detection.Firstly,this paper discusses the mainstream Contrail Detection Algorithm (CDA) and its various extension algorithms in Europe and America,and summarizes the seasonal and diurnal variation characteristics of line-shaped contrails coverage over Western Europe,North America and other regions.Then this paper discusses several calculation schemes for the optical depth of line-shaped contrails and their calculation uncertainties.Finally,this paper analyses the radiative forcing of line-shaped contrails and its relationship with the coverage and optical thickness,and points out the problems existing in present studies of contrails and their future development direction.