Abstract: 【Objective】 As a new composite material in recent years，bamboo scrimber has excellent physical and mechanical properties and machining properties and has been used in many industries such as furniture and construction. The durability and physical properties of the material are reduced due to the complex use environment and the characteristics of moisture absorption and expansion of bamboo materials，which are also often exposed to the environment of high temperature，humidity and microbial diversity. To explore the influence of the surface coating process on the paint film performance of bamboo scrimber helps to solve the problem that the durability and physical properties of bamboo scrimber materials decrease in the complex environments. 【Method】 In this paper，we explored the changes in paint film properties of bamboo scrimber after coating in different process conditions，and mainly studied the effects of the sanding process，coating amount of polyurethane primer，spreading rate of nitrocellulose topcoat，drying conditions，and the number of coating times of nitrocellulose topcoat on the paint film properties during the coating process. 【Result】 The initial surface of bamboo scrimber was firstly sanded with 180-grit sandpaper and then 320-grit sandpaper；the coating amount of polyurethane primer was 120 g·m^-2；on the basis that the coating amount of nitrocellulose paint upon the intermediate layer of was 250 g·m^-2，the coating amount of nitrocellulose topcoat was 150 g·m^-2，coated 1 time，and the film adhesion is grade 1，hardness is 2H，abrasion resistance grade is grade 1，gloss is 70.6，and water vapor resistance grade is grade 2. 【Conclusion】 This study has explored that the variation of the initial sanding process of bamboo scrimber，the amount of polyurethane primer coating，the amount of nitrocellulose topcoat coating，the drying conditions and the number of nitrocellulose topcoat coating have a great influence on the performance of the paint film，and the best coating process is：sand the surface of the bamboo scrimber with 180-grit sandpaper，then with 320-grit sandpaper，and then brush with 120 g·m^-2 polyurethane paint，and dry it at room temperature for 1 hour. Lightly sand the surface with 320-grit sandpaper and brush it with 250 g·m^-2 intermediate-layer nitrocellulose paint，and dry it at room temperature for 48 hours，lightly sand the surface with 320-grit sandpaper and brush the surface with 150 g·m^-2 nitrocellulose topcoat and dry it at room temperature for 48 hours.