Info-agriculture, the information technology system of agriculture,the technology front line of info-agriculture and the stratagem of Chinese info-agriculture have been introduced in this paper. In the part of info-agriculture ,this paper brings forward the basic conception of info-agriculture, and points out eight characters of info-agriculture. In the technology system of info-agriculture, the author puts forwarded five technology systems, that is, acquirement of information, management, transmission, development and application, industrialization and revelation. In the technology front line of info-agriculture, six problems have been discussed, that is, agriculture information mechanism needs to be researched in agriculture information science, the catalog system, standard and criterion of agriculture information, the error theory and agriculture information transfer, the relative theory of agriculture information, the theory of agriculture information flow control and agriculture information inversion. There are seven front line issues: crop growing model, aptitude expert system, virtual agriculture, integration of agriculture information technology, virtual agriculture information nets, precision agriculture, standard system of info-agriculture. In the strategy of info-agriculture in China, eight constructions of agriculture information technology should be developed, that is, extending the resource of agriculture information, building service center of agriculture information, management constructing national and provincial speedy system of agriculture, the expert system of agriculture, the development and construction of agriculture resource information, service system of agriculture, management information system of agriculture, educational net system of agriculture, and developing auto technology of agriculture.