Taking the balancing link with permanent magnet driven directly bogie for the research target, the influence of balancing link tilt angle on motor motion and primary load of bogies with permanent magnet driven directly was studied by calculation. Compared with horizontal and tilt the two kinds of layouts scheme, the conclusion was get that balancing link should be arranged with horizontal or small angle. The work lays theoretical foundation for determine the scheme of permanent magnet driven directly system of bogies.