The　link　between　microstructure　evolution,　micromodulated　domain　and　the　structure　transformation　of　Ni-Mn-Ga　shape　memory　microwires　prepared　with　rapid　solidification　is　studied　systematically　by　TEM　and　HRTEM.　Multiple　microdomain　structures　are　determined　according　to　the　corresponding　diffraction　spots.　The　domain　structure　with　a　periodic　distortion　is　a　kind　of　characteristic　of　premartensitic　phase.　When　cooling　below　the　martensitic　transformation　temperature,　the　austenitic　phase　transforms　to　modulated　5M　martensite,　and　the　sequence　of　phase　transformation　can　finally　be　confirmed　from　austenite　to　premartensite　to　5M　martensite　during　cooling.　The　characterization　of　micromodulated　domain　and　the　structure　characteristics　of　austenite　at　atomic　scale　provide　comprehensive　understanding　on　the　martensitic　phase　transformation　route.　(C)　2018　Published　by　Elsevier　B.V.