MW-assisted preparation of nHA was found to besignifi-cantly efficient and economic . Hence,agrowing interest in MW-assisted processing of biomaterials is develop- ing andexpanding . Here,we will focus only on theMW- assisted processes that have reported the synthesis of pureHA in theNano-scale for the last 25 years(from1990toMay 2015) . Doped HA or MW prepared HA inlarger particle sizes or with othe rphases was excluded from this review. MW-assisteds in tering of nHA was also excluded.The validation of the proposed HA precipitation mechanism was inspected compared to the HA precipitation using conventional heating. The aim of the study is to bette runder stan difthere is any difference between the action mechanism between