Threefold Contemplation is the essential element of contemplation method in T’ien-tai Buddhism. It is delineated from Four Teachings. But there are only Separate-teaching and Perfect-teaching these two teachings involve complete Threefold Contemplation, and can reach to the ultimate destination. The purposes of this paper are to introduce the Separate Threefold Contemplation which belongs to Separate-teaching and the Threefold Contemplation in one single Mind which belongs to Perfect-teaching, the relationship between these two teaching and Three Kinds of Contemplation, and to compare the former with the latter in six aspects: l. the way of contemplation, 2. cleaning out vexations, 3. grades of practicing, 4. ultimate goal, 5. natures of practicing, 6. speed of practicing. In my opinion, the Gradual Contemplation includes Four Teaching and Separate-teaching is it’s representation. The contemplation way of Perfect-teaching is the most excellent and quickly way, but it is suitable only for the best nature of Bodhisattva. On the contrary, the contemplation way of Separate-teaching is by gradual way. Although it takes very long time to arrive the ultimate goal, it’s a sure-footed way and suitable for all of Bodhisattva. Besides, one can practice all the other ways of Three Contemplations when practicing Contemplation of Emptiness or Contemplation of Provisional and thinking about the “Threefold Truth” (three Truths which are inseparable). By this way, one can get into the “Universal Form Threefold Contemplation”, and advance to practice Threefold Contemplation in one single Mind. So the Separate Threefold Contemplation is worth to be recommended.