Research conclusions: From the line functional, investment and economic points of view, the speed target "value of 200-250 km/h should be adopted for the Fourth Line of Haerbin-Qiqihaer Railway, and the speed target value of 300 km/h is the worst in investment profits. Therefore, it is proposed the speed target value of 200 km/h will be adopted in the early opening period of the line, but construction of infrastructure is conducted in accordance with 200-250 km/h because it only needs a little more investment in construction of 200-250 km/h line and the line is already in high plane standard.