Cationic rosin was prepared with HSCS-02 quaternary ammonium type cationic starch (CS) as additive and sorbide oleate (Span80) and polyoxyethylene (20) sorbitol anhydride monostearate (Tween60) as emulsifier. The effect of cationic dispersed rosin on the apparent performance of molded pulp product was investigated with different amount of CS, Span 80 and Tween60. CS, Span80 and Tween60 were added to the molten rosin to produce emulsified and modified cationic dispersed rosin. Paper mould sample was made by internal sizing. Its gloss and surface friction coefficient were measured to evaluate the apparent performance of molded paper product. With the increase of the amount of Span80, Tween60 and CS, the friction coefficient of sample declined first and rose later while the gloss rose first and decreased later. In conclusion, the quarternary ammonium group in HSCS-02 quaternary ammonium type cationic starch can significantly decrease the interfacial tension between molten rosin and water, and provide appropriate positive charge to emulsion particles with rosin particles. Rosin particles can better attach to anionic paper pulp fiber, thus the apparent performance of paper mould can be improved; however, the excessive amount of CS will flocculate the fiber and thus reduce the molding evenness of molded paper product and degrade its apparent performance. The optimal mass fraction is 20% (relative to that of rosin). Span80 and Tween60 have good emulsification on rosin, and the optimal mass fraction is 10% (relative to that of rosin).