Abstract: First, we study the theories and method of sea surface temperature forecast, and establish a new mathematical model based on the finite element method and heat balance equation. Computer graphic processing for the results is also introduced, and all the programs are compiled. Finally, we compute and analyz the method through a specific example and prove that the method is practicable and feasible. The programs for computer graphic processing in this paper can serve as general-purpose programs, to some degree, for other areas.