4 Kinds of Inbred line hybrids 1)Single cross hybrid (Two inbred lines (2) Double cross hybrid(Four inbred lines) ( 3) Three-way cross hybrid(Tree inbred lines) (4)Synthetic hybrid (Over 8 inbred lines)(1) Single cross hybrid (Two inbred lines) (2) Double cross hybrid (Four inbred lines) (3) Three-way cross hybrid (Tree inbred lines) (4) Synthetic hybrid (Over 8 inbred lines) 4. Kinds of Inbred line Hybrids