Abstract： The qualitative features of the four intrashell P states of the boron atom, i.e., the 2Ｐ01 (ground state), 2Ｐ02，2Ｐe1 and 4Ｐe1 states, are investigated. The interelectronic correlation is found to be strongly spindependent. The preferrence of orientation (redative to the total angular momentum) is found to be explicit. The geometric structures of relevant states and the modes of internal motion have been investigated. The decisive effect of quantum mechanical symmetry has been emphasized.