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This paper presents RCS predicting software code based on high-frequency technique, Physical Optics (PO) and Physical Theory of Diffraction (PTD) which is powerful asymptotic technique for the surface and edge currents integral in the computation of RCS for large and complex objects. By distinguish between illuminated and un-illuminated areas for multiple scattering fields from target, we can obtain total polarimetric scattering fields into observation. Target model is available for not only isolated one but also wide area terrain surface, ground or sea, with various forms of vegetation or tree. For the sake of shadowing accuracy, an adaptive subdivision scheme algorithm, which is depending on the situation of incident-, reflection-, scattering-shadowing and multiple reflections, is applied to processing of this distinguish. Since both of co- and cross-polarized RCS fields are calculated, the results are useful and effective for studying full-polarimetric radar or remote-sensing SAR image analysis. In this paper we report the developing code to calculate RCS and show several calculating examples in the meeting presentation.