This study aims to determine the physical quality of Pakchong grass silage (Crimson pennywort cv. Thailand) with the addition of molasses. Variableobserved were texture, color, aroma, pH and presence or absence of mold. This study used pakchong grass taken from Waipirit Village, Kairatu District, West Seram Regency, and molasses. The research was conducted at the Laboratory of Feed Engineering, Department of Animal Husbandry Pattimura University for 21 days. The experimental design used was a completely randomized design consisting of 4 treatments and 4 replications, namely P0 = pakchong grass + 0% molasses P1 = pakchong grass + 2.5% molasses P2 = pakchong grass + 5% molasses P3 = pakchong grass + 7.5% molasses. The results showed that the addition of molasses doses showed a significant effect on texture, color, aroma, pH but had a not significant effect on the presence or absence of mold. The higher the dose of molasses given the lower the degree of acidity (pH). The addition of 5% molasses gave the best results on the physical quality of silage, namely soft, dense and not slimy texture, good color (yellowish green), sour aroma, no fungus and had a pH value of 3.6.