The　light　transmitting　cement　mortar　is　to　rely　on　a　large　number　of　optical　fiber　embedded　in　the　block　transferring　light　from　the　light　side　surface　to　the　dark　side.　In　this　article,　the　preparation　method　of　light　transmitting　cement　mortar　(LTCM)　was　introduced　and　the　strength　and　light　transmitting　properties　of　LTCM　were　tested　too.　The　results　show　that　the　LTCM　can　get　higher　light　transmitting　ratio　and　can　also　achieve,　even　exceed　the　light　transmitting　ratio　of　the　70g　A4　print　paper　in　the　light　wavelength　range　of　520　similar　to　630nm.