As the basis of the drawing board, towel canvas inside the box of wood is appropriate to use straight wood, the inner frame of the system should be thin and thin, cross-section was ramp-shaped, surrounded by live tenon wedge, elastic can be adjusted, so Drawing board and inner frame is not easy to warp deformation, the canvas does not break. Keep the oil painting environment, the humidity should be between 50 ~ 60%, up and down not more than 2 ~ 5%, in order to avoid oil painting moisture expansion, resulting in oil layer and the base of the separation or partial hollowing, oil yellow, white Mold rotten and so on. Save the oil painting environment temperature should be 15 ~ 25 ℃, up and down no more than 2 ~ 5 ℃, in order to avoid oil painting warping deformation, oil layer aging fragile, darkened picture black. Excessive light or long lack of natural light will damage the oil paintings, but oil paintings, such as long-term storage in the dark, will be dark gray.