diff --git a/rm_gimbal_controllers/cfg/BulletSolver.cfg b/rm_gimbal_controllers/cfg/BulletSolver.cfg
index 01bcc6dd..d3c0848b 100755
--- a/rm_gimbal_controllers/cfg/BulletSolver.cfg
+++ b/rm_gimbal_controllers/cfg/BulletSolver.cfg
@@ -12,8 +12,8 @@ gen.add("resistance_coff_qd_18", double_t, 0, "Air resistance divided by mass of
 gen.add("resistance_coff_qd_30", double_t, 0, "Air resistance divided by mass of 10 m/s", 0.1, 0, 5.0)
 gen.add("g", double_t, 0, "Air resistance divided by mass", 9.8, 9.6, 10.0)
 gen.add("delay", double_t, 0, "Delay of bullet firing", 0.0, 0, 0.5)
-gen.add("track_center_next_delay", double_t, 0, "Delay of shoot next target when in center mode", 0.0, 0, 0.5)
-gen.add("track_center_second_delay", double_t, 0, "Delay of shoot second target when in center mode", 0.0, 0, 0.5)
+gen.add("track_center_next_delay", double_t, 0, "Delay of shoot next target when in center mode", 0.0, 0.105, 0.5)
+gen.add("track_center_second_delay", double_t, 0, "Delay of shoot second target when in center mode", 0.0, 0.105, 0.5)
 gen.add("dt", double_t, 0, "Iteration interval", 0.01, 0.0001, 0.1)
 gen.add("timeout", double_t, 0, "Flight time exceeded", 2.0, 0.5, 3.0)
 gen.add("ban_shoot_duration", double_t, 0, "Ban shoot duration while beforehand shooting", 0.0, 0.0, 2.0)
@@ -21,7 +21,7 @@ gen.add("gimbal_switch_duration", double_t, 0, "Gimbal switch duration", 0.0, 0.
 gen.add("max_switch_angle", double_t, 0, "Max switch angle", 40.0, 0.0, 90.0)
 gen.add("min_switch_angle", double_t, 0, "Min switch angle", 2.0, 0.0, 90.0)
 gen.add("min_fit_switch_count", int_t, 0, "Min count that current angle fit switch angle", 0, 3, 99)
-gen.add("min_shoot_beforehand_vel", double_t, 0, "Min velocity to shoot beforehand", 5.0, 0.0, 20)
+gen.add("min_shoot_beforehand_vel", double_t, 0, "Min velocity to shoot beforehand", 0.0, 4.5, 20)
 gen.add("max_chassis_angular_vel", double_t, 0, "Max chassis angular vel to switch target armor to center", 0.0, 0.0, 99.0)
 gen.add("track_rotate_target_delay", double_t, 0, "Used to estimate current armor's yaw", 0.0, -1.0, 1.0)
 gen.add("track_move_target_delay", double_t, 0, "Used to estimate current armor's position when moving", 0.0, -1.0, 1.0)