Abstract: The paper compares and analyzes relative regulations about parallel laying spacing for long-distance oil and gas pipelines specified in standards and criteria at home and abroad.and introduces actual situations in design of parallel laying spacing and, or construction maintenance interval for Middle-Asia Natural(las Transmission Pipeline.Western Oil/Products Oil Pipeline and West-to East Natural Gas Ⅰ ransmission Pipeline.From the viewpoint of design, determination principle on parallel laying spacing of long-distance oil and gas pipelines is analyzed.