In order to promote the internationalization of Chinese standards and The Belt and Road construction，we introduce the design calculation parameters and performance evaluation method of the leading line in domestic and foreign engineering，compare the value differences of key parameters in domestic and foreign codes from the perspectives of calculation principle，data analysis，refine and decompose the guide axis，vertical opening angle，off-axis distance and evaluation method，and obtain the differences and disadvantages of domestic and foreign codes，and compare and analyze the design parameters of the engineering example calculated by domestic and foreign codes. The results show that the design principles of domestic and foreign codes are basically the same，but there are some differences in value of the vertical opening angle，horizontal off-axis distance and effectiveness evaluation of leading line.