The invention relates to a virtual machine, and discloses a method and a device based on a virtual machine creation software performance testing environment. The method comprises the following steps of responding acquired hard disk reading and writing requests triggered by a virtual CPU (central processing unit) of the virtual machine; informing a virtual CPU scheduler recording consumed CPU time limit t1 of the virtual CPU in a current CPU scheduling period; responding detected hard disk reading and writing processing completion corresponding to the hard disk reading and writing request; forecasting hard disk reading and writing time delay t corresponding to the hard disk reading and writing request in an objective environment; informing the virtual CPU scheduler of determining consumed CPU time limit of the virtual CPU in the current CPU scheduling period according to the recorded CPU time limit t1 and the hard disk reading and writing time delay t; and adjusting a system clock of the virtual machine according to the consumed CPU time limit of the virtual CPU in the current determined CPU scheduling period. According to the method in an embodiment, a software performance testing result which is consistent to a high-configuration server of the objective environment can be measured in a created software performance testing environment.