Liquefied natural gas（LNG） as a green energy source has a huge market demand. The construction of onshore LNG plants has the characteristics of large-scale and integrated. Modular construction can meet the requirements of shortening construction period，reducing costs，and reducing pollution. From three aspects of protective coating design，coating construction，and coating defect repair，this article provides a targeted interpretation of the design of coating materials and coating systems，design standards and related requirements for organic coatings，metal coatings，fireproof coatings，etc.，as well as coating structure design requirements during the modular construction of large-scale land LNG plants. Combined with the actual painting process application personnel certification assessment，surface treatment requirements，coating construction，thermal spraying aluminum application requirements，and coating protection in the construction process are described. At the same time，the defects of organic coatings and metal coatings in the construction process and repair methods are summarized. Corresponding engineering experience recommendations are proposed，hoping to provide reference for relevant personnel.