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With the application of STM32 Controller widely used,the demand for remote firmware update function of the controller is increasingly strong.Base on the principle of Programming in-application(IAP) and taking STM32f103 as an example,a scheme of controller firmware online update based on 485 bus is desinged.A remote firmware update PC control software is programmed.The self-define serial communication protocol is adopted to improve the effectivesess of data transmission. The function of remotely updating firmware of STM32 comtroller on 485 bus is realized.The practical results that by the scheme not only avoids assemble of devices or setting jumpers,but also saves time and manpower cost.The firmware update process is convenient and quick,easy to operate and high reliability.The utility model can be widely used in STM32 controller with in-application programming systems.