Method and system for carrying out safety check on application installation and application server

The invention provides a method and a system for carrying out safety check on application installation and an application server. The method comprises the steps that an application downloading requestis initiated from an application webpage end, an application server end responds to the downloading request and downloads a target application from the application server end, and the target application is obtained after an original application is encrypted according to a preset encryption algorithm; after the target application is downloaded, calling an application installation safety check system to decrypt the target application according to a preset decryption algorithm, and determining whether the target application can be restored to obtain the original application or not; and when it is determined that the original application is obtained through reduction, installing the original application. According to the method, the original application can be installed only when it is determined that the original ap