Abstract: Assuming the planetary albedo is equal to a temperature square.a zero-dimensional stochastic-dynamic climate model has been suggested.The appropriate Fokker-Planck equation is solved by use of the matrix continude-fraction method,eigen values and eigen vectors of 100000a.40000a and 20000a climatic periods are obtained.It is shown from the numerical computation that the climatic fluctuation of 100000a has maximum amplitude when taking intensity of random noise D=1.95.the fluctuation is not explained with the Milankovitch theorv.