The Canada Advanced Digital Ionosonde (CADI) is a kind of low-cost, compact and full featured ionosonde, which is capable of good performance in observation and research of ionosphere physics. However the original software for CADI was developed in the DOS operating system, being limited in several points. Recently a CADI ionosonde was installed at Beijing space environment station (40.3°N, 116.2°E), China and its routine operation has started. In this paper, we present a visual C++ program prototype “CadiScale”, which can be used to perform the preliminary scaling of CADI ionograms. This program also owns the capability for autoscaling the F2 and Es layer parameters. This program can be modified easily to scale other types of ionograms.