The key for constructing microbial cell factories relies on the design of biosynthetic pathway. However, naturally evolved pathways might be optimal for survival and propagation of living beings but not for the highly efficient production of target chemicals. To address this, we will firstly conceive the novel pathways using computational method, mine the required enzymes from the currently available database, and finally assemble those enzymes together into the microbial hosts. Through creation and application of those novel pathways with superior capacities, we hope achieve the high production of the interested products.