Abstract: It is synthesized that the principle observational features of solar surges, especially the magnetic features within the active region of surges. Using the plasma dynamical pinch theory and Petschek's mechanism, we present a possible mechanism of solar surges, namelya impulsive magnetic flux emergence in the active region--the periodical dynamical pinchof the plasma--the fast reconnection of the magnetic force lines--the ejection of surgeplasma. This mechanism successfully explains the periodicity of the surge ejection as well as the other main physical properties of solar surges.