A method of measuring light source angles is presented based on the optical line transmission characteristic.The sensors on the polyhedron flats to measure light source angles are applied.The light source angles measuring is changed into the geometry angles computing in the space geometry by means of constructing equivalent vector model

so that the measurement is simplified.The azimuth and the pitching angle between light source and the measured point are included in the measuring method.At the same time

this method is suitable for light source angles measurement in the sky or on the ground.In this way

the prior art measurement range insufficient is resolved.The results of the measurement for solar angle prove that the method is correct and feasible.