By using one-dimensional photon state-vector function obtained previously, a general analytic expression is deduced for the optical two-hole interference experiment, which not only greatly enlarges the range of the observable, but also completely represents the probability distribution for a photon in the whole space. On the basis of the basic rules of quantum optics, we quantitatively analyze and discuss the domain of definition of the experiment, and the quantum behavior of the interference item on the average of space.