We review methods for reducing TDM crosstalk in an inline FBG based Fabry-Perot sensor. Based on documents and
materials read recent years and current work, causes of TDM crosstalk and the characteristics of suppression methods
relative to the causes are analyzed. It is present in detail that the method of reducing TDM crosstalk using layer peeling
algorithm from respects of key technology, principles of the method, as well as its development and applications.