The　non-isothermal　and　isothermal　crystallization　kinetics　of　Zr72.5Al10Fe17.5　glassy　alloy　was　investigated　using　differential　scanning　calorimeter　(DSC).　Under　non-isothermal　heating　condition,　the　primary　phase　in　the　initial　crystallization　is　Zr6Al2　Fe　phase　and　the　final　crystallized　products　consist　of　Zr6Al2Fe,　Zr2Fe　and　alpha-Zr　phases.　The　apparent　activation　energy　for　crystallization　estimated　using　the　Kissinger　method　is　342.1　+/-　8.1　kJ/mol.　The　local　activation　energy　decreased　with　the　increase　in　the　crystallization　volume　fraction　during　nonisothermal　crystallization.　Under　isothermal　heating　condition,　the　average　Avrami　exponent　of　about　2.76　implies　a　mainly　diffusion-controlled　three-dimensional　growth　with　an　increasing　nucleation　rate.　The　local　activation　energy　for　isothermal　crystallization　shows　a　different　variation　trend　from　that　for　non-isothermal　crystallization,　indicating　different　nucleation-and-growth　mechanisms　for　the　two　crystallizaiton　conditions.