Abstract: For steel pipe line which is welded joint to a line and launched by jacking method, the incurred stresses under launching and service period are quite different from precast reinforced concrete pipe. Based on machenics theories, accounting for the characteristics of surrounding forces on pipe and displacement of the pipe under jacking or service periods, the designer presents new method to calculate stresses, offers several formula. There are also modifications presented for the comtemprary design specification in transverse earth load calculation formula.