Abstract: Taking Yunnan province as an example，using SPSS 21.0 and AOMS 17.0，through structural equation model，based on planning behavior theory of psychology，impact model of farmers′ information cognition on transformation of modern agriculture was constructed.According to statistical results，behavioral attitude（AB），subjective norm（SN）and perceptual behavior control（PBC）of three dimensions of farmers′ information cognition had significant positive effects on agricultural modernization，and behavioral attitude（AB）as an intermediary variable was also affected by main factors.Influence of SN and PBC was different.Therefore，identity of farmers should be paid more attention，and their knowledge and technology capabilities should be improved，vital interests of modern information agriculture to farmers should be paid attention.Farmers were encouraged to rely on their own autonomy to promote transformation of information-based modern agriculture.