The parity of harmonic oscillator is analyzed.And from parity conservation,the possible value of angular momentum is deduced by the fact that the same energy level has identical degeneracy.

• 对三维以内的谐振子的宇称进行分析，并由宇称守恒出发，根据同一能级的简并度相同，导出谐振子角动量的可能值.