Nowadays technical harmonization is mainly used for ensuring unified functioning of the European Union internal market. In order to guarantee the functioning of it and mutual recognition as well as to promote international trade, the reliability of the activities carried out needs to be ensured by conformity assessment. The aim of the paper is to identify problems and offer new solutions thus improving the conformity assessment system and put forward proposals for technical harmonization improvement. The paper is focused on the product conformity assessment, as the limited scope of the research does not allow inspecting different kinds of conformity assessment. Research was done using qualitative and quantitative research methods. The research findings can be used by several interested parties in conformity assessment, and makes more clearly conformity assessment processes and ensure that safe products placed on the market. This reporting can be used as guidelines for improvement of conformity assessment system and technical harmonization in European Union.