Technical advantages and equipment innovation for 230 t/h large capacity CDQ plant are introduced in this paper,which is a brand-new technology integrating double-flue,new type primary deduster and coke breeze cooling,etc..Compared with the old technology,i.e.two sets of CDQ plants are customized for coke oven,the new type large capacity CDQ plant will have less land occupation,lower initial investment by 20%~25%,less operating cost by 20%,and additional investment return by 30%.