A logical proposition may be conditional or unconditional. Condition is expressed in propositions with specific purposes. Logic, which is responsible for analyzing propositions and expressing its judgments, has introduced propositions in which different methods of condition are presented. This article seeks the possibility of condition in propositions and presents different methods of condition in them. The next purpose of this article is the function of condition in each and expressing their distinction. A proposition has elements and components, and the conditions can be considered for each of them. Condition in propositions is related to judgment, direction and subject. The judgment in propositions is undoubted. Therefore, if a judgment is suspended and conditional, it is stated in the form of a conditional proposition in order to include suspention and undoubted states both. Other forms of condition are in the form of predicative propositions and more in the subject area. Conditional modified propositions are those in which the condition refers to the direction, and in real, conditional, hypothetical propositions the condition relates to the subject