Abstract: With the consideration of the stochastic effect of ocean surface temperature fluctuation (OSTF) during non-adiabatic heating of the atmosphere by the tropical ocean, an evolution epuation of Langevin type is established for the va-riation atmospheric heat. The steady-state solution of the random differential equation yields a heating potential function and probability density function. With a definite thermodynamical parameter, curves of the heating potential function and probability density distribution are obtained through the calculation of observed OSTF variances. Moreover, probability density stream is computed and relaxation time is derived for penetrating the potential castle between two steady states. Calculations indicate that the measured drag coefficient C_D and the OSTF variance q² can be used to predict the stochastic effect of anomalous ocean surface temperature, which has & duration of the order of 140 days.