In this paper, the state feedback pole assignment problem of singular systems is investigated. It is well known that the pole assignment of singular systems is equivalent to the one for normal systems. The above theory is re-developed through the application of the orthogonal similarity transformation, which is numerically stable. The merit of this approach is that almost all existing methods for assigning poles in normal systems can be generalized to solve the problem in a reliable way. Parallel algorithms for this generalization procedure are also discussed.