It doesn't work when I use ‘Serial1’.

Compiling 'test' for 'Generic STM32F1 series'

Error linking for board Generic STM32F1 series
Build failed for project 'test'

ld.exe: test.cpp.o: in function vTest(void*)
test.ino: (.text._ZL5vTestPv+0x4c): undefined reference to Serial1

ld.exe: test.cpp.o: in function setup
test.ino: (.text.setup+0x54): undefined reference to Serial1

ld.exe: test.cpp.o: in function vTest2(void*)
test.ino: (.text._ZL6vTest2Pv+0x3c): undefined reference to Serial1

collect2.exe*: error: ld returned 1 exit status

And when I use ‘Serial’，it doesn't display any data.

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Thanks for the report.

Can you attach the full build output with the vMicro > Compiler > Verbose, and Show Build Properties options Enabled?

Here is the output.

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Thanks for the log detail.

Note - This also happens when trying a simple sketch in the Arduino IDE, so believe this board/configuration does not have the Serial1 object available.

Both Serial and Serial2 work for this setup, and believe this is linked to the different Serial port mappings happening in the background in the STM Cores and setup.
https://github.com/stm32duino/wiki/wiki/API#hardwareserial

The example in the above link implies this has to be declared in the sketch, or the build options changed to force it to be automatically mapped.

It's running! I'm very grateful for your timely help. :)

Another question need help.When I use the 'Serial1',it can not print Chinese Characters.
But when I use 'Serial' in the Arduino IDE ,it works.(another project https://github.com/rogerclarkmelbourne/Arduino_STM32)