In this paper, I examine the logical structure of teleological argument and D. Hume's critiques about it, then evaluate the arguments power and significance. Hume's critiques can be summed up in two main points. 1. About the premise of the argument: The concept of "theological order" is based on an anthropomorphic analogy and this is inappropriate. 2. About the conclusion of the argument: TheArgument doesn't lead us to the God of theistic religions. In the paper, different concepts of order are analyzed and according to this analysis Hume's critiques are discussed widely in the light of R. Swinburne's new formulation of the argument. At the end, in the light of those discussions, I investigate power and significance of the argument