What document class? If article, try either \appendix \renewcommand{\theequation}{\thesection\arabic{equation}} \section{...} % Appendix A \setcounter{equation}{0} ... \section{...} % Appendix B \setcounter{equation}{0} ... or \usepackage{amsmath} ... \appendix \numberwithin{equation}{section} \section{...} % Appendix A ... \section{...} % Appendix B ... The first method gives A1, A2, B1, B2, while the second method gives A.1, A.2, B.1, B.2, etc.