The　nonlinear　output　characteristics　of　photovoltaic　cells,　single-phase　single-stage　PV　grid　system＇s　hardware　topology　and　common　maximum　power　point　tracking　(MPPT)　control　method　are　discussed.　The　fuzzy　PID　control　method　is　introduced　to　the　MPPT　control　for　the　shortcoming　of　traditional　first-order-type　MPPT　control　in　the　single-stage　grid-connected　power　system.　MPPT　control　block　diagram　of　the　system　and　fuzzy　PID　controller　design　process　is　given　in　detail.　PSIM　software-based　simulation　platform　is　built,　and　then　the　proposed　control　method　is　simulated　and　implemented　on　the　experimental　prototype　finally.　Simulation　and　experimental　results　show　the　feasibility　and　effectiveness　of　the　scheme.