The invention discloses a method of coloring the surface of a bronze with stable black, brown and chestnut color at a constant temperature. The bronze material of the bronze particularly relates to a313 copper alloy formula and a C90300 copper alloy formula; and the constant temperature stable coloring is realized by immersing the bronze in three different reagents. The colors adhered by adoptingthe coloring technology are uniform and stable. In particular, the method achieves the effect that the colors on the surface of the bronze are very stable for years.