1.4D is an effective technology for creating and maintaining a good working environment, including arrangement, responsibility, implementation and training. 2. Implementation steps: Organization: set up a 4D implementation team and make an activity plan. 2. Rules: Organize the formulation of various 4D specifications and auditing standards. 3. Training: publicize the basic knowledge of 4D and various 4D specifications. 4. Implementation: fully implement the provisions of 4D and conduct self-audit. 5. Supervision: Organize inspection and mutual evaluation.