Foreign body analysis mainly involves three aspects, one organic structure analysis of foreign bodies, mainly by infrared FTIR analysis; the second is the elemental composition of objects or material surface analysis, primarily by electronic probe (EPMA), scanning electron microscope spectrometer (SEM- EDX), multifunction photoelectron spectroscopy (XPS), energy dispersive X-ray fluorescence spectrometer (EDX); three is observed on the surface, mainly with an optical microscope (OM) and electron microscopy (eg SEM), scientific research and production component identification, adjustment formula, new product development, improve the production process to provide a scientific basis. Foreign body analysis techniques typically used in the following circumstances: just the products produced there are a number of black spots surface contamination or oil and other defects and other abnormalities, or after a period of storage, transportation and other sectors, the sudden appearance of some tiny spots, oil, flour fingers and other foreign matter, this time on much-needed foreign body analysis method can analyze what substances belong to these foreign bodies, and then look for sources of pollution or contamination areas, exclusion, improved formulation systems to improve product quality. Generate foreign matter due to variety, a lot of foreign material may have torpedoed the product sense, even a threat to the safety of production and, therefore, foreign body analysis was to protect the stability of production exists. ?