Polarization　coherent　optical　information　has　a　wide　range　of　applications　in　information　coding,　communication　and　bioassay.　Based　on　the　characteristics　of　polarization　coherent　light,　we　introduced　a　method　to　measure　S2　and　S3　which　were　used　for　information　coding　in　continuous　variables　coherent　optical　communication　in　this　paper.　Then　we　introduced　an　experimental　technique　for　getting　the　information　of　polarized　light　by　analysizing　the　intensity　distribution　of　polarization　state　in　polarization　speckle,　and　how　to　apply　this　technology　in　the　identification　and　analysis　of　biological　tissues.　By　analysizing　a　Mueller　matrix　which　is　used　to　characterize　the　coherent　information　obtained　from　the　measurement　of　the　Stokes　parameters,　we　can　get　some　properties　of　biological　tissues.　©　(2013)　Trans　Tech　Publications,　Switzerland.