for what it's worth, I'd concur with Olla v-nigrum

After check under microscope, it is more like Photo#8871 (Florida) but without white marking on face. Whie markings only on neck. Since is very variant, I'm not sure who it is. Is there any difference in neck-head length between these two species? I also found many types of Harmonia axyridis on lotus flower and leaf, and my vegetable gardern.

this is not Harmonia. white markings on the face of many ladybird species simply indicates a male vs. the more dark-faced females. #8871 is almost certainly a male, where as yours appears to be a female. Males of some species can also have more pale area on the pronotum, especially along the apical margin. The shape of the red/orange spots on the elytra is also characteristic of O. v., not Harmonia.