The invention discloses a write operation method of virtual machine block equipment and a snapshot creation method and device. The virtual machine block equipment at least comprises more than two sub-blocks. The write operation method comprises the following steps: when indication information indicating that a first sub-block creates a new snapshot from a first service node is received, suspendinga write operation for the first sub-block; inquiring whether the new snapshot of the second sub-block is created completely or not to the second service node so as to determine whether the snapshot of the current virtual machine block equipment is created completely or not; when it is determined that snapshot creation of the current virtual machine block device is completed, recovering a write operation for the first sub-block; wherein the virtual machine block device at least comprises more than two sub-blocks; wherein the second sub-block is a preset snapshot synchronization point, and thefirst sub-block is any sub-block which is not the snapshot synchronization point in the virtual machine block device and is performing a write operation. According to the method and the device, distributed snapshots of virtual machine block equipment segmented into a plurality of sub-blocks can meet the time consistency.