Abstract: Circular restricted three-body problem is widely discussed in celestial mechanics with its numerous applications such as the research of asteroids and spacecrafts.Based on a rotating reference frame,the same problem is studied in electromagnetism.Some characters,especially quasi-Lagrange points,are derived with similarities in gravitational environment,and their practical worth is suggested.

Key words: classical electromagnetism, circular restricted three-body problem, quasi-Lagrange points, stability