HRB400 ribbed bars that had low cost advantage was developed by synthetic using technology of Nb-Microalloyied and controlled rolling, controlled cooling. Technologic thought, chemical composition design, produce route, smelting process, continuous cast process and rolling process were recommended in this paper. Φ12～25mm HRB400 ribbed bar could be mongline rolled , adding 0.008～0.028% Nb into it; Φ28～32mm HRB400 ribbed bar could be mongline rolled, Φ16～20mm HRB400 ribbed bar could be slit rolled, adding 0.021～0.036% Nb and 0.010～0.027% Ti into it, in the base of chemical composition of 20MnSi. Temperature of colling bed should be controlled in the range of 810-870℃ at the time of rolling. Microstructure of ribbed bar was F+P, or F+P+B(small). There was not self tempered structure on its surface.