Abstract: Many 51 MCU learners want to continue to learn high-performance STM 32，but most of them cannot stick to it for various reasons，and generally consider as learming STM 32 is difficult. The author believes that the reason is that many people just simply learn STM 32，but don't combine 51 MCU and STM 32 to learn.Based on the stating point ,this article tries to compare and analyze the register programing of STM 32 and 51 MCU to better understand the register programing of STM 32.

Key words: ５１ＭＣＵ, ＳＴＭ３２ｒｅｇｉｓｔｅｒ, ｐｒｏｇｒａｍｍｉｎｇ