The thesis title ‘’ Recognition of writing Letters Thai languages ‘’ was prepared for Learn how to write letters Thai languages by using the algorithms in the analysis of the results and improve efficiency in recognition merge technique. Various concepts to propose new ideas provide performance in better recognition by using the program MATLAB in recognition. Recognition is recognizing the computer science with the purpose to digest forms by calculation objects (Objects) into categories (Classes) based on the model of the object by calculations are used techniques from other fields to help. In which this thesis choose the master technique of artificial neural network. Artificial neural network is a mathematical model or computer model for the processing of information by the effective recognition and thus apply.