The relationship between the electrostatic field distribution and geometric parameters on the controllable electrostatic double-well was calculated and analyzed. The dependent relationship between the trapped central position and system parameters was also calculated and analyzed. The results show that position of the trapped center and depth of the trapped well can be changed by changing the scheme system parameters, thus the cold molecular can be obtained by the Stark deceleration, and even the higher temperature cold molecular trapping can be realized by selecting suitable system parameters.