The major research interests of Prof. Daiqian Xie focus on theories and computation of potential energy surfaces and bounds and quasibound rovibrational states of molecules, photodissociation dynamics and molecular collisions. The projects currently underway are time-independent theory of photodissociation dynamics and cumulative reaction probabilities, accurate ab inito potential energy surface of small molecules and Van der Waals complexes, vibrations of small molecules from solid surface.Theories and computations of potential energy surfaces and bounds and quasibound rovibrational states of molecules, photodissociation dynamics and molecular collisions.