This presentation will discuss how to improve application quality by implementing machine learning technology. It has been proved that machine learning is very powerful in image processing, data cleaning up and other fields. I will go through the main machine learning technology including artificial neural network, tree models etc. It will be followed by two real cases in YVW about improving application quality by using machine learning technology.One of them is verifying images by using artificial neural network. Machine learning model can automatically find invalid photos without human’s invention. The other case is about finding duplicated client records by comparing similarity of them.