The invention relates to a method based on a polling mechanism to prevent a credible client virtual domain from initiating collapse. The method can keep the credible client virtual domain from initiating collapse during the start-up of a system when the creation of a virtual credible platform module is slow. In the method, integrity measuring software in a kernel initiating document of the virtual domain undergoes function expansion, so the method is simple and has good compatibility and strong expandability. The measuring software with more powerful function is not immediately devoted to the initialization after being loaded, instead, the virtual credible platform module is detected first, i.e. the request for accessing a virtual credible platform module register is sent out till a correct result is returned, and then the software initialization begins. The method delays the detection work to the time ahead of the initialization of the first virtual domain software which accesses the virtual credible platform module so that the advantage of the original system, i.e. the effective utilization of system resources, can be maintained.