The DNA 3d model is an intuitive biological teaching tool used to demonstrate the double helix structure of DNA molecules. This model reproduces the winding pattern of two complementary strands of DNA and the pairing rules of base pairs. In biology teaching, 3D models of DNA can help students visually understand the molecular structure of DNA and learn the principle of complementary base pairing, which involves pairing adenine (A) with thymine (T) and guanine (G) with cytosine (C). By observing and operating models, students can master the basic processes of genetic information transmission such as DNA replication, transcription, and translation, which plays an important role in cultivating students' knowledge of molecular biology and scientific exploration ability.