Abstract: In order to solve the scaling problem which has serious influence on the normal production of oil wells in Zhongyuan Oilfield, the scaling principle and scaling prediction technology of oil wells in Zhongyuan Oilfield are investigated. The paper uses the mathematical model and criteria of Ryznar index method to predict calcium carbonate scale and uses Oddo-Tomson saturation index method after temperature, pressure and ionic strength correction to predict sulfate scale, in the environment of Visual Basic 6.0, combining with Access database and based on the programming method faced with object, a scaling trend prediction software in VB language has been developed. By calculating scaling index of calcium carbonate and sulfate using the water quality data on the spot, and analyzing the formation of the scale samples from oil wells, the component of the scale sample is basically identical with the prediction result of scaling trend, which shows that this scaling prediction software is practical, can predict scaling trend rapidly and accurately, and give corresponding solutions and advice.