Conservation Equation of Periodic Numbers in 3N+1 Conjecture

The component exponent sequence P(a) of odd number a and the concept of the component exponent sequence′s summation ∑P(a) is put forward,geting the simple compute formula of component exponent sequence's summation ∑P(a),then proving periodicity of 3N+1 conjecture must meet a balance equation which plays an important role in the demonstration.