Based on the cement concrete pavement upgrading of Renmin road in Zhanjiang city, this paper describes the importance of old cement concrete pavement testing and evaluation for choosing a reasonable overlay scheme and determining the thickness of asphalt overlay, discusses the principles for old cement concrete pavement evaluation, establishes an evaluation index system for the design of old cement concrete pavement overlay, and analyzes the way of using the old road evaluation index to determine an appropriate design scheme of overlay structure.