The purpose of this paper is to make a instrument through GoogleDocs form for diagnostic test of grammar, search for an actual utilizationplan. A function of Google Docs form is an effective instrument for diagnostictest of grammar. If teacher use a diagnostic test of grammar wasmade through Google Docs form, student could finish a test using smartdevices. Teacher could check immediately and exactly the result of test. So teacher could understanding easily an attribute of their student. Actually, This study carry a diagnostic test of grammar for smart deviceinto effect in classroom. A awareness of student is mainly positive. “like a target education”, “I have a feeling a participation in lesson”, “It isbizarre.”, “It is interesting”. This can make a participation in lesson as wellas a positve awareness of student.