The significant wind radii are vital parameters representing tropical cyclones (TC) structure and determining the extent of the destructive winds of TCs. While the lack of in situ observations in the far sea leads to the scarcity of TC wind radii data is gradually resolved with. s the development of high spatial-temporal resolution remote sensing detection technology. Then the significant wind radii of TCs from them are well researched and providing good options for operational applications. However, IR images characterize generally the cloud-top scenes for TCs. On the other hand, scatterometers together with radiometers operating at microwave frequencies advantaging at offering good information for ocean surface wind fields of TCs, introducing good references for IR winds during their passing in the Sun-Synchronous Orbits. In this research, first, significant wind radii are obtained from the wind fields obtained from combined observations of the scatterometer (HSCAT) and radiometer (HRAD) on-board the HY-2A satellite in the method proposed in [1], then radius values are fitted and comparisons are made with those from IR images obtained in method described in [2], following with a case study of the TC Pabuk in 2013. Results indicate consistency between the significant wind radii from both methods, while more samples are to be check for a much definite conclusion. The analysis of differences in observation and retrieving are also to be conducted in further research, with calibration made to the IR radii. When this research conducted forms important first step for providing reliable wind radii from remote sensing methods.