The present invention discloses a method, a system and a program for a browser to switch an IE Kernel which may be able to solve the problems of compatibility and adaptability of the browser kernel. The method comprises: generating a first IE kernel file and a second IE kernel file, and import them into a browser client; the browser process determining a currently adapted IE kernel version according to Uniform Resource Locator (URL) information submitted by a user; if the currently adapted IE kernel version is the first IE kernel, the browser process being redirected to a corresponding location to load the first IE kernel file; if the currently adapted IE kernel version is the second IE kernel, the browser process being redirected to a corresponding location to load the second IE kernel file.