This paper analyzes the relationship between regional large-scale wind power ramp and large-scale weather system based on real-time 15-min power outputs of 24 wind farms in Shandong Province in 2013 and related WRF (Weather Research and Forecasting) forecasting data and the FNL (Final Operational Global Analysis) re-analysis data. Results indicate that large-scale weather systems, especially the blocking high, are the important reason that induces the large-scale wind power ramp in Shandong Province. Using the swinging door algorithm, the wind power ramp events are re-defined and recognized first. The characteristics and predictability of wind power ramp events are then analyzed. It is found that the wind power report-check regulation should seriously consider the forecasting accuracy during the ramp events for the purpose to improve the stability of grid operation.