The upper and lower chromatic number of uniform mixed hypergraphs have inevitable relation with C-hyperedge and D-hyperedge. In general, the increase in the C- hyperedge will increase lower chromatic number XH, increasing D-hyperedge will decrease upper chromatic number X¯H. This papers take complete uniform mixed hypergraphs for example, revealed further the relationship of C-hyperedge with between the upper chromatic number and lower chromatic number. We give a few conclusions for mixed hypergraph K(n, l,m) = (X, (Xl) , (Xm)) whose some C-hyperedge are deleted. [ABSTRACT FROM AUTHOR]