Existence of photonic band gap is the key to the application of one-dimensional photonic crystals. Some methods have been proposed to extend the photonic band gap, which are normally based on frequency domain. In this paper, experiment has been carried out to verify one new extension method, which is based on the incident angle domain. In experiment the relative band width of hybrid structure composed of four one dimensional photonic crystals is up to 37%. This indicates that this new method can extend the photonic band gap of one dimensional photonic crystals greatly.