Abstract: Supported by GIS technology, an objective TC (Tropical Cyclone) center positioning system integrating much data and arithmetic is performed. All kinds of vector and raster layer data, such as Quikscat wind distribution on the ocean, weather state, forecast state, different satellite images and different band images of the same satellite, are super positioned together and analyzed in this system. It is helpful to show TC characters in many ways. Many TC center positioning methods, such as analyzing cloud form, finding the warmest point on cloud and eroding or dilating cloud image to find TC center, are synthesized to make TC center positioning more objective, precision and roboticized, center of 0203, 0209, 0212, 0417 and 0419 TC are positioned by this system. The result shows that the precision of this system is close to that of operation TC center positioning. It proves that this system could be applied in operation