Density functional theory on level of B3LYP at 6-311++G(d,p) was used to calculate CCl₃F geometrical parameters, dipole moments, charge distribution and total energies of ground state of CCl₃F molecule under external electric fields(F=-0.025~0.025 a.u.). It shows that with decreasing of C-Cl band distance, charge distribution of Cl increases. Molecular geometric parameter and total energy are strongly dependent on increasing field intensity. IR vibrationt spectrum of CCl₃F molecule shows observable blue shift as electric field increased to F=-0.02 a.u.