In order to improve fruit set rate and reduce abnormal fruit rate of bell pepper，this paper took bell
pepper（Capsicum annuum L. var. grossum）cultivar‘ Shijihong’ as testing material，and studied on the effects
of 3 kinds of formulas on the yield，numbers of fruit set and commodity fruit rate of bell pepper. The application
effects of the optimum formula on pod pepper，linear hot pepper，and ox horn pepper were compared under low
temperature and weak illumination，suboptimal temperature and weak illumination，and high temperature. The
result indicated that spraying formula P ₂（Solution A：Compound sodium nitrophenolate 0.03 g·mL^-1，Solution
B：Gibberellin 0.10 g·mL^-1，2，4-D sodium salt 0.01 g·mL^-1，Naphthalene acetic acid sodium salt 0.10
g·mL^-1）had the best effect on retention of flower and fruit. The yield per plot of bell pepper and number of fruit
set were all significantly higher than that of the CK，and yet the commodity fruit rate and single fruit weight had no
remarkable differences from the CK. After spraying P₂ formula on different types of pepper，the yield per plot of
pepper，numbers of fruit set were significantly increased，and yet there were no significant difference between
the CK and P₂ in commodity fruit rate and single fruit weight. Therefore，formula P₂ could solve the contradiction
between abnormal fruit rate and fruit set rate of sweet pepper or hot pepper，and had good stability. So formula P₂
could be used in different types of pepper under different environmental stress on retention of pepper flower and
fruit.