Abstract: The minimum time principle was generalized. It is assumed that in global time zeroed coordinate, which fits g₀i=0, the optical path makes the coordinate time interval minimum. According to this assumption, the deflection angle of light pass by the sun surface is α=4GM/r=1.75″, which is the same as that obtained before. This is essentially a sustaining of the no super-light velocity principle in general relativity. The basic assumption about the optical behavior is proposed, so it is totally a new theory. A method was given in calculating the optical path, which may be helpful for studying the light transition in cosmic.

Key words: gravitational deflection, minimum time principle, super-light velocity, Schwarzschild field