Abstract: This paper aims to study the combining ability and heritability of the polysaccharide component. 6 tomato parents with different characteristics (referred to as No.1, 2, 3, 4, 5 and No. 6 in the text) were used to develop 30 hybrid combinations according to Griffing complete diallel cross (p2). The combining ability and heritability of carbohydrate composition (i.e. sucrose, glucose and fructose) among six tomato parents and 30 hybrid combinations were studied. Results indicated that only F value of parents among the combinations of sucrose quality characteristics reached extremely significant level, and hybrid combinations and genotypes were not significantly different, so the analysis of combining ability could not be conducted, indicating that the differences of sucrose in various combinations were not obvious. The F values of quality characteristic of glucose and fructose reached significant or extremely significant level among parents, combinations and genotypes, which indicated that they had significant differences. The quality characteristic of tomato could be analyzed according to Griffing I. The results showed that parent No. 3 and 4 were optimal ones in tomato breeding for sweetness, and 3×4 was also the best cross combination for high polysaccharide.