Abstract: Using the observations from two marine surveys and some conventional sources,temporal-spacial structure is analysed for tow cold current surges. In addition to confirming the argument that cold surges are characterized by gravity waves,the work concludes that:(1) The 20-25m/s of the front edge propagation for the surges is close to the theoretical speed for internal gravity wave;(2) The distribution of skew-T and log-P in the atmosphere before the arrival of cold surges determines whether or not a cold surge will behave like gravity wave;(3) Cold surges propagating like gravity wave transport energy to lower latitude oceans more efficiently than those moving in the manner of advection.