First with a dust-free sanding or milling machine for old ground overall: 1, minor sanding, dust and other conditions for organization of professional technicians on the old ground floor for testing, to find out the root cause of the old floor plan issued Solution polish (workshop equipment to use protective film wrap) until stiff concrete layer, and finally clean up, clean the ground; resistant floor or concrete floor sealant curing agent according to customer requirements to re-construction or emery epoxy floor systems. 2. Ground grease: professional company to arrange the degree of contamination depends on the ground floor technician issued grease solution: a small area of ??the oil with a low concentration of acid lotion after washing and waxing; such a large area must be skimmed oil or pollution is very serious after , de-oiling, grinding and other processing, and then the customer to determine the appropriate construction floor and do maintenance to avoid corrosion ground oil again. 3. Crack treatment company to arrange for professional and technical personnel on-site investigation of the old floor cracks, identify the root causes of the program after the issue: If it is epoxy floor cracks, the cracks can not simply deal with the problem of working, but also consider whether cracks have delamination, from the shell, etc; crack treatment can use portable grinders to cut a V-shaped groove cracks, cleaning, clean, and then you can fill in leveling epoxy mortar. 4. hollowing, ground handling potholes potholes, hollowing make difficult ground leveling, first use the grinding machine grinding, hollowing place to eradicate the ground, and then high-strength epoxy mortar or repair mortar repair, final construction customers The selected floor system construction.