e　are　considering　estimation　in　a　generalized　varying　coefficient　partially　linear　model　for　clustered　data　using　generalized　estimating　equations.　This　article　is　proposing　an　EM　algorithm　technique　to　estimate　the　parametric　component　and　the　nonparametric　coefficient　function.　From　simulation　we　can　see　clearly　that.　in　order　to　get　the　general　consistent　estimator　of　the　parametric　part.　we　need　not　undersmoothing　the　nonparametric　part..　Unlike　other　method　in　estimating　the　parameter　and　the　nonoparametric　coefficient　function,　the　optimal　bandwidth　for　the　model　is　similar　to　nonparametric　model.　so　the　method　of　leaving-one-cluster-out　cross-validation　could　be　directly　used　in　selecting　bandwidth.