A new maximum power point tracking (MPPT) topology for a gridconnected PV system considering the sudden changes in environmeons was proposed. Considering the nonlinear characteristics of photovoltaic array according to actual condition, maximum power point of PV voltage oscillation around as well as the design of the inverter and filter and so on. In order to ensure the stability of the system adopts the control algorithm, the design of the maximum power point tracking arised at the historic moment, through the improved algorithm from photovoltaic system reference current and voltage and current predictive control photovoltaic (PV) gridconnected system. Based on compared with the ripple correlation control (RCC) method of the traditional and the simulation results were given. The simulation results showed that: Compared with the ripple correlation control (RCC) method when the solar radiation generate the sudden changes, the proposed improved algorithm of tracking speed increased 9.3%, the new algorithm not only could accurately track the maximum power point of photovoltaic (PV) gridconnected system, but also had the stable and reliable performance.