Based on the fact that multi-stage fluid activities play an important role in the interaction between jadeitite and symplectitic coronas, the authors focused on the study of the composition and the mode of occurrence of water in the symplectitic coronas of amphibole + chromite jadeite + jadeite in Myanmar amphibolite jadeitite from the micro scale point of view. The results show that the fluid composition involved in the formation of symplectitic coronas is complex and the formation process is of multi-stage. The paragenetic minerals of symplectitic coronas are different, the chemical composition zone of amphibole+ chromite jadeite + jadeite is widely developed in amphibolite jadeitite. In addition, the structural hydroxyl content of amphibole is more uniform in the core of symplectitic coronas, and from the edge of chromite jadeite to jadeite the structural hydroxyl content increases regularly. The change regularity of structural hydroxyl content further indicates that the formation environment of the symplectitic coronas in Myanmar jadeitite is relatively stable, which is dominated by multi-stage fluid metasomatism, without large-scale dynamic metamorphism. The evolution of the composition and water content of symplectitic coronas in Myanmar jadeitite is helpful to understanding the interaction trajectory of the fluids in the subduction zone in this area and providing some evidence for the diagenetic mechanism of Myanmar jadeitite.