The invention relates to a distributed photovoltaic generation-oriented grid management method and system. A GIS (Geographic Information System) is taken as a basis, a distributed photovoltaic data layer is added into the GIS, and distributed photovoltaic parameter information is integrated in the data layer; a transformer substation data layer is added into the GIS; a grid numerical value weatherforecast data layer is added into the GIS; the distributed photovoltaic data layer, the transformer substation data layer and the grid numerical value weather forecast data layer are overlapped, wherein overlapping is realized through a database table; and the grid of the numerical value weather forecast is taken as a basic unit to carry out data processing on the distributed photovoltaic power station. Through the technical scheme of the invention, the distributed photovoltaic of a provincial power grid can be effectively managed, and therefore, the problem that a power dispatching department is difficult in management due to large distributed photovoltaic amount and scattered geographic positions can be solved.