Abstract: In this paper，the evaluation problem of agricultural informatization level of Guangdong province is took as the main research topic. At first, an evaluation system which has 4 first-level indexes and 10 second-level indexes is built.Secondly, the advantages and main steps of Error-eliminating evaluation method are introduced. And then, the method of Error-eliminating evaluation is used to evaluate the agricultural informatization level of Guangdong province. The results show that, since the new century, the development of agricultural informatization in Guangdong has through relatively undeveloped and whole improved periods, the overall level is improved steadily, and the construction and application of information infrastructure are the key factors for agricultural informatization in Guangdong.