A method of analyzing RNA extracted from a tissue or cell(s) fixed with a fixative, said method comprising a determining step of whether said RNA satisfies: B/A≦1 wherein A represents the weight ratio (%) of RNA within the range of 1000 to 4000 nucleotides with respect to the total weight of RNA as determined by electrophoresis; and B represents the weight ratio (%) of RNA within the range of more than 4000 nucleotides with respect to the total weight of RNA as determined by electrophoresis.