Mobile devices are effective tools for language leing and have positive effect on the development of language skills , heighten leers language leing attitudes and motivation, and support leer interaction, collaboration, and the co-construction of knowledge. In spite of the popularity of mobile dictionaries among students, research on the effect of this app on stu?dentslanguage leing , especially focusing on the students from vocational school in rural area, is still scarce. So the purpose of the current study is probing into the effect of using mobile dictionaries on lower-intermediate studentslanguage leing, focusing on the students from vocational school in rural areas, in contrast to using printed dictionaries. This proposal is arranged as follows:section one presents the research background; section two reviews literatures; section three provides research problems and re?search design;section four presents data analysis and anticipated results. This proposal ends with conclusions. In term of research aims, a mixed method of quantitative and qualitative will be applied with the main aim of probing the effect of using mobile diction?aries on studentsEnglish leing and the opinions of studentson using the mobile dictionaries in English leing. Research methods in the form of quasi-experimental pre-and post-tests, questionnaires, interview will be undertaken to collect data.