Base on the dynamic competitive theory, the study explores the influence of technological innovation on competitive tension of technology. The influence will intervene to predict the behaviors of competition and rival responses precisely. Thus, the study combines competitive tension theory and method of patent analysis to verify the relationship by analyzing the data of patents during 2001 to 2012 on the DRAM industry. The results show that: First, there is a phenomenon of competitive asymmetry of technology between focal firm and rivals in the DRAM industry. Second, technological innovations will positive influence on competitive tension of technology exiting on the equivalent firms. Finally, firms can execute particular technological innovation to manipulate the competitive asymmetry on the rivals.