"Kao Hua" is a unified name for armor clothing in Beijing Opera. Generally can be divided into hard support, soft support and improved support.

The flag inserted in the back is called "leaning on the flag", which is generally difficult to rely on.

The oblique flag is a triangular four-sided flag inserted in the back, also called the back-protecting flag. The flag is embroidered with dragons with various colored lines. Each flag is tied with a colored ribbon. During the action, flags and ribbons fluttered gracefully. Relying on flags is not available in real life. It's hard to imagine how you can fight in armor made of iron leaves with four flags hanging from your back. Some people think that relying on the flag is a change of the ancient command flag, which is just speculation and has no basis. On the stage, we can see that these four flags have nothing to do with giving orders. The flag has only one side, and no matter how it develops, it will not develop into four sides. Besides, the flag is inserted in the back, not around the neck, and it can't be pulled down at any time. Therefore, relying on the flag is only a decorative dance tool, a special dance tool to render the prestige of military commanders, show the skills of performers, increase the dynamic beauty of dance, and thus help shape the characters. Later, because some Peking Opera artists designed some difficult movements by relying on flags, relying on flags further developed from ordinary dance costume decoration and became an auxiliary tool for difficult skills. For example, Guan, a performing artist in Yunnan, used the elasticity of the flagpole to bounce back the opponent's weapon when fighting. As we all know, we usually do some actions with our hands, feet and legs. However, Guan uses the elasticity of the flagpole to perform, which enhances the tension and thrilling effect. Another example is Li, a performing artist in Tianjin, who threw his weapon "whip" in mid-air before the end of the drama "Golden Beach". Then, as soon as he turned around, the whip landed right in the gap surrounded by the flag, and at the same time it showed a very terrible look. It forms a very beautiful and precise shape.