According to the vulnerability of the optical network from the Geography Distribution, this paper gives a method of constructing the model of geographical disaster and researching the vulnerability of optical network. The paper also proposes a spatial probabilistic model to simulate the disaster of real-world scenarios and correlated link failures and simultaneously analyzes the correlation among the disasters. According to correlated link failures of geographical disaster, the four scenarios of disaster of the two classes those are of inhibition and clustering are analyzed by choosing the variance, radial and probability density. By computing the reliability of the four scenarios of disaster, the conclusion is obtained that the most effective range is 200 km and the type of the attack is of clustering disaster. Then the most effective attack is adopted to simulate in the actual network topology, the result shows that the use of this scheme can capture the vulnerable region and reduce the time complexity of algorithm.