In order to study the heat transfer rule of microreactor in depth, the Bandelet finite element model is established using Bandelet basis function as interpolating function. Firstly, the mathematical model and property of Bandelet transformation are analyzed. Secondly, the heat transfer Bandelet finite element model of microreactor is constructed. Finally, the effectiveness of Bandelet finite element method is verified through comparing analysis between simulation and experimental results, the computing precision and accuracy of heat transfer of microreactor can be improved based on the proposed method. In addition, the relationship between Nusselt number and Reynolds number is analyzed. The inlet velocity has obvious effect on the heat transfer of microreactor. The influence of main geometric sizes concluding height and diameter of micro-pin-fin on heat transfer performance of microreactor is obtained. The analysis results can offer favorable basis for optimization of microreactor and enrich the theoretical system of heat transfer of microreactor. (C) 2018 Elsevier Ltd. All rights reserved.