The paper discussed the difficulties and problems in experimental researches in educational technology, such as misunderstanding in teachers' concept, disjointedness between theory and practice, inadequate understanding of dialectics in experimental educational technology researches, research project selection and theoretical hypothesis formation are passive and onefold, single and irregular experimental control, simple ways and methods of measurement, more quantitative analysis and fewer qualitative analysis, simple statistical analysis. And provide some suggestions: bottom-up selection; various kinds of research training; emphasizing experimental data; controlling experimental process effectively; combination of qualitative and quantitative researches; integration of various research methods.