Event in the case, the maximum responsibility is operator, he did not follow the Guidance Notes on Safe Use of Power-operated Elevating Work Platforms。 First, table of the machine is not set up with its outriggers fully extended and leveled off, also when the crane suddenly tilted, he should not down the left of support. It should see clear site situation again decided processing method, because although the suspected the crane tilted, but the workers on the platform wearing a safety belt, so it was quite safe, immediately sought police assistance.