The drinking of tea has gradually become the world trend and fashion, the constantly expanded demand of tea stimulate its production, and the economic development of tea has drawn the world's attention, but the influence of large-scaled and specialized tea plangting on agriculture ecosystem didn't get the corresponding focus. In order to study the ecological effect of specialized tea planting on agricultural ecosystem with the expanded planting size, we chose Anxi that a county with specialized tea planting as a case. Evaluation based on three aspects which contain different specialized tea planting level, agricultural planting structures and geomorphic types through the method of emergy and the building of agricultural ecosystem services function value evaluation index system.The evaluation index system including positive and negative services of the provisioning, regulating and supporting function. The results show that (1) all the three services function have higher value on positive service, and the agriculture ecosystem that mainly based on specialized tea planting of Anxi give priority to providing positive service; (2)specialized tea planting has high economic benefit and well gas and climate regulation ability, which has a positive effect on the agricultural ecosystem's provisioning and regulating services function; but(3)soil erosion cased by specialized tea planting is a little serious, which has a negative influence on agricultural ecosystem supporting function;(4) the "tea-vegetation" and "tea-fruit" multiple ecological planting structure is conducive to improving agricultural ecosystem services function, and achieve the harmonious development of the tea economy and agricultural ecosystem.