To provide a method of improving a peel strength of a tarpaulin sheet, wherein a colored pattern is printed on a base fabric, and a transparent film is laminated on the surface.

In a tarpaulin sheet, wherein a colored pattern layer 2 is printed on a base fabric 1 by a pigment, innumerable white parts 3 without the pigment are dispersed in dots in the colored pattern layer 2. When a transparent film 4 is heated and fused with an adhesive 5 on the surface of the colored pattern layer 2, fused adhering bodies 6, wherein melting parts of the adhesive 5 and the transparent film 4 are fused, are pressed and penetrated to the white parts 3 for adhering to the base fabric 1. Thereby, the transparent film 4 and the base fabric 1 are directly adhered with solidity.