Based on torsion field theory, we research some new results. First, it is a generalization of general relativity to Einstein-Cartan theory. Next, torsion can derive spin, so it may combine general relativity and quantum mechanics. Third, torsion may unify gravitational field and electromagnetic field. Fourth, torsion can describe various helices, from galaxies, biological sciences to DNA, and the left and right rotations are different, such as the energy spectrum. Fifth, torsion field is possibly the theoretical foundation of quantum entanglement. Its propagation equation obtains wave, whose analogy to the gravitational wave has several features, nonlinear, superluminal, etc. Torsion in negative matter is discussed. Finally, we research some applications of torsion field, such as astronomy, particle physics, plant, bioscience and DNA, parapsychology, etc. Torsion field is worth exploration, and can be widely applied.