Abstract: BEM is a kind of numerical method developing rapidly.Some problems about the application of plane orthotropic boundary elements to moregeneral composite laminates are studied in this paper.They include the equivalent single plate of laminate,the off-axis fundamental solution,the analytic calculation of influence coefficients of straight high-order boundary elements,and the expression of stresses at any interior point.The examples show that the results of BEM are consistent with the analytic solutions and the results of FEM.