Rotation period is one of the most important derived management goals in steering the production in even aged stands. This paper describes specially the determination of the optimal rotation period using the normal forest model, which is usually derived from optimization studies. In order to draw more near the real forest situation the target forest model was introduced. The target forest model by including production risks is more realistic in forest production than the normal forest model . The optimal rotation period was determined using the target forest model. And the optimal rotation period derived with the normal forest model and the target forest model were compared each other. These model calculations were carried out with data, which was investigated in korean pine stands in experiment forest of College of Forestry in Kangweon National University.