A field experiment was conducted to study the effects of combining application of slow-release potassium fertilizer (SRPF), conventional potassium fertilizer (CPF, as CK) and fulvic acid potassium (BSFA) on contents of plastid pigment and its degraded products in flue-cured tobacco leaves. Results showed that chlorophyll contents in tobacco leaves were highest in T1 and T2 (SRPF). Contents of plastid pigment degraded products between middle and upper leaves in T2 were lower than T1. Chlorophyll contents of middle and upper leaves in T3 (SRPF+CPF) were lower than T1, and contents of plastid pigment degraded products in middle leaves in T3 were higher than T1, but contents of total plastid pigment degraded products and carotenoids in upper leaves in T3 were lower than T1. Chlorophyll contents of middle and upper leaves in T4 (SRPF+CPF+BSFA) were lower than T1, and carotenoids in upper leaves were higher than T1. Contents of plastid pigment degraded products in upper leaves were higher than other treatments, and contents of plastid pigment degraded products in middle leaves were lower than T3. Besides, twelve different kinds of carotenoid degraded products in upper leaves and eight different kinds of carotenoid degraded products in middle leaves in T4 were the highest. Therefore, the best treatment was T4.