Quality is the primary productive force. Westinghouse Elevator always adheres to the principle that "special equipment quality assurance system is implemented in the whole process, and national standards only set the lower limit of process value", and guides the quality level from the source with the design and development far beyond the national standards. Therefore, the resulting inspection and testing standards must be strict and reliable, and the production process must also be high-standard controllable. The corresponding equipment, raw materials, production, installation, maintenance and other links can be improved through continuous system audit and continuous review and improvement to promote quality progress.