Abstract: In view of farmers′ demand for modern agricultural information and better guidance for farmers′ production，an agricultural information service platform based on mobile terminals was proposed.Through analysis of system requirements， overall framework of system and mobile internet terminal function module were designed.And focused crawler algorithm and price prediction algorithm of agricultural information based on time series and ARMA were introduced to grasp and forecast for agricultural products.The platform could publish relevant information about agricultural products，so farmers could understand different kinds of agricultural products planting techndogy.And it release related agricultural information，and accelerated construction of the last kilometer of agricultural informatization.