Abstract: In this paper, the initiation and track of Roy. a storm over the South China Sea. and its relation to surrounding systems are mainly discussed.It has been found that the upper cold vortices not only provided a favourable environment for the initial development of Roy. but also affected its track. Two upper cold vortices propagating along the TUTT and passing by the north of Roy caused the storm to deflect from the steering currenlts resultant in a complicated track In affecting the initiation and track of storm, the cross-equatorial currents over the South Asia and the monsoon currents coming from India also play important role same as upper cold vortices.