Abstract: The grid-connected photovoltaic（PV） inverter is a key component in the photovoltaic power generation system. This paper analyzes the one-sidedness and inaccuracy of three evaluation methods, including European efficiency, CEC efficiency and Chinese efficiency evaluation indicators, for the efficiency of grid-connected PV inverters operating in the typical type-Ⅰirradiation area of China. Then an evaluation model for the efficiency of grid-connected PV inverters is developed. Based on the meteorological data from 2016 to 2017 in Ningxia of China, the key factors affecting the performance of grid-connected PV inverter in the actual operation condition are considered in the model, including the types of PV components, ambient temperature, wind speed, optimal irradiance inclination angle,sampling interval of 2 min, etc. The evaluation method is suitable for typical type-Ⅰirradiation area of China, which provides a more reasonable evaluation index for the selection and design of inverters in the construction of photovoltaic power plants in the area. And it also offers a reference to accurately reflect the power output of gridconnected PV inverter in the actual operation condition and evaluate its power generation performance.