How to minimize unity empty project ?

I just created new project without importing any packages(assets folder is empty),and then build it targeting android platform ,i got the apk file of 8 mb size ,can i reduce this size or just it’s the default size of unity project ?

If you’re on Unity Pro then you can set Stripping Level in the Player Settings to reduce the compiled APK size. Other than that, I don’t think you can do anything - every Unity project has to contain the Mono runtime in which it runs, and there’s only so much you can squeeze that down to.