In　order　to　investigate　the　influence　of　mineral　admixtures　on　the　early　shrinkage　of　concrete　under　steel　bar　confinement,　the　early　shrinkage　strain　and　stress　of　reinforced　concrete　were　measured.　Steel　ring　testing　method　has　been　used　to　investigate　the　shrinkage　crack　of　different　concrete.　The　test　results　show　that,　slag　and　silica　fume　obviously　increase　the　early　shrinkage　of　concrete.　Limestone　powder　and　fly　ash　will　obviously　suppress　the　early　shrinkage,　and　it　shows　that　the　effect　of　limestone　powder　is　better.　Expensive　agent　can　obviously　decrease　the　early　shrinkage.　It　demonstrates　that　steel　ring　testing　method　was　a　good　testing　method　for　checking　shrinkage　cracking.