This paper analyzes the characteristics of the design change of telecommunicationcable line engineering and gets the keys of establishing the code of telecommunication cable line engineering’s design modification. On the basis of the relative value standard associated with the reserve rate and the absolute value comes from the old version of the code

it builds the model of routing length’s change. Combining earned value management and pareto diagram Analysis

it refines the process of design modification to strengthen the standardized management of telecommunication cable line engineering.