Allusion　to　the　crack　of　concrete,　the　authors　studied　on　GT　anti-cracking　agent　to　improve　the　character　of　anti-cracking　or　release　the　crack　of　the　concrete.　GT　anti-cracking　agent　is　a　novel　concrete　anti-cracking　agent　made　of　CSA　high　efficiency　expansive　agent　and　polymer　at　a　certain　ratio.　Experiments　have　been　done　to　investigate　the　anti-cracking　related　properties　such　as　the　mechanical　properties,　shrinkage,　expansion,　early　age　shrinkage　of　the　mortar　specimens　with　the　addition　of　GT　anti-cracking　agent.　The　results　demonstrate　that　GT　anti-cracking　agent　is　an　optimistic　anti-cracking　material　and　has　a　remarkable　effect　on　suppressing　the　cracks　of　cement　mortar.