For the first time attempts were made to study the rheological and morphological properties of polypropylene/ ethylene vinyl acetate copolymer blends and its nanocomposites containing a new generation of halogen-free flame retardants commercially known as "NOR116". Scanning electron microscope (SEM), transmission electron microscope (TEM) and wide angle X-ray scattering (WAXS) analysis were implemented in order to study of morphological properties. Effect of presence of two different types of compatibilizer, flame retardant and organoclay on morphology of samples was investigated. By considering chemical nature of compatibilizers and SEM images, TEM micrographs and organoclay localization were accurately predicted. Using rheological measurements in three different modes of frequency, temperature and time sweeps, linear viscoelastic properties, alterations in these properties by increasing temperature and morphological evolution at higher temperatures were investigated. Using frequency sweep experiment miscibility level of blends and their interfacial properties were studied. A good correlation between these properties and morphological observations was established. Also, It was found that variation in linear viscoelastic properties of samples by temperature strictly depends on blend morphology and chemical structure of components. In the case of pure blend a single phase morphology which was indication of increasing miscibility was detected at higher temperatures.