(Break Isolation and Sandbox in the Instant Apps) With the rapid development of mobile internet, apps become more and more complex. However, their most used functions are limited to a few pages. Enters instant app. It has many advantages over normal apps, such as click-to-play and concise design, and it's becoming more and more popular. There is some form of instant app framework in many popular apps, such as Google Play, TikTok, etc. In addition, many phone vendors have also embedded instant app frameworks in their pre-installed applications. However, there is barely any public research on attacking instant apps.