A　new　inducing　crack　method　for　measurement　of　cracking　behavior　of　concrete　is　developed,　aiming　at　solving　the　problem　in　the　current　test　method　of　concrete　cracking　behaviors.　The　trustiness　of　the　method　is　verified　by　mathematical　analysis　and　experiment.　The　method　overcomes　the　shortage　of　conventional　test　method　that　the　place　where　crack　appears　is　stochastic　and　the　width　of　crack　is　smaller　and　the　crack　appears　late.　And　because　of　these　shortage　the　observation　of　crack　is　difficult,　the　experiment　takes　longer　time　and　the　error　of　experiment　is　big.　The　method　developed　can　avoid　the　error　caused　by　concrete　heterogeneity.