In this work, a novel micro-assembly method using molecular-motor-powered artificial muscles is presented. A UV scanning system was set up to fast optically pattern artificial muscles from microtubules and kinesins. With this system, micro-components could be accurately assembled by fabricated artificial muscles in microfluidic channel. The successful assemblies of hexagon micro-components have proved the feasibility of this method. We believe this new micro-assembly with simple operation and low cost has a great potential in MEMS applications.