Abstract: In this paper, the factors influencing hybrid seed production of sweet pepper in Hainan province was studied in detail. The results showed that the plump seeds attained the tiptop when picked androecium the first day and pollinated the next morning. When relative humidity was greater than 70% and temperature was among 25~30℃, the germination rate would be higher. Among the three ripe fruit, the full ripe fruit had the highest germination rate, and afterripening had little influence, while to the others, their germination rate became higher along with the time of afterripening prolonged. And the highest germination rate of the full ripe fruit almost kept steadiness after having hold 200 days under normal temperature, whereas the other two descended rapidly. Aimed at the above results, the project and ways to improve the yield and purity of hybrid seed production had also been bring forward.