## 1 Introduction  
The molecular dynamic process in the intense femtosecond laser has attracted extensive attention for wide applications in ultrafast laser techniques [1; 2; 3; 4; 5; 6]. [PERSON] et al. put forward and developed theories to judge the electron(s) behavior under different laser intensities [7; 8; 9]. When femtosecond laser intensity is low, the molecular internal barrier is hardly suppressed. Therefore, molecules have to absorb multi-photons to reach an ionic state, then parent cations dissociate into fragment ion(s) and neutral parts with relatively low kinetic energies. By analyzing the kinetic energy release distributions and angular distribution, the excited states of singly charged molecular ions and nuclei motion dynamics can be revealed [10; 11]. As laser intensity still increases, the molecular internal barrier would be strongly suppressed, even below the valence electron energy. Hence, the electrons are mostly stripped away by a higher intensity laser field, and the multi-charged parent ions would rapidly dissociate into fragments by internal Coulomb repulsive force, which is named as Coulomb explosion (CE). With the help of Coulomb explosion imaging, the abundant dynamic processes in intense laser fields, such as the evolution of excited state wave-packets and the related molecular structure deformation, have been discovered [12; 13]. It has attracted considerable interest in the photodissociation of halogenated hydrocarbons (e.g., CH\({}_{2}\)XY, where X, Y = F, Cl, and Br) for the possibility of selective control on the dissociation. In recent years, many studies have focused on the carbon halogen bond cleavage by single-photon excitation using an ultraviolet laser field. [PERSON] et al. studied the photodissociation of CH\({}_{2}\)BrCl at 193 nm, the branching ratio of C-Cl versus C-Br bond rupture was 4.5, and the major reaction pathway originated from the C-Cl bond fission rather than the weaker C-Br bond [14]. [PERSON] et al. have studied the photodissociation of BrCH\({}_{2}\)COCl at a 248 nm laser field. Compared with a predicted statistical branching ratio of 1:30, the branching ratio was 1.0:1.1 for the fission of the C-Cl and C-Brbonds, which resulted from the relative strengths of the electronic coupling between the initially excited n\(\pi\)*-bound configuration and the two no* states, and the weaker coupling inhibited the adiabatic crossing over the barrier to C-Br bond fission [15]. [PERSON] et al. studied the photolysis of ClBrCHCF\({}_{3}\) at 234 nm by a hexapolar electrostatic field and velocity-map imaging detection system. They found that the relative yield ratio of Cl to Br was found to be approximately 2, and the results were not only relevant for a detailed understanding of adiabatic versus diabatic coupling mechanisms, but also pointed out the possibility of selectively inducing specific dissociation pathways [16]. The selective photodissociation dynamic process of CHBrCl\({}_{2}\) molecules is also a problem worthy of attention. Unlike UV radiation, the near-infrared femtosecond laser field provides a good insight into the complex electron dynamics and nuclei behavior in an ultrashort timescale by investigating these phenomena and exploring the potential physical mechanisms. However, there are only a few previous studies of CHBrCl\({}_{2}\) in an intense femtosecond laser field. In this paper, we experimentally demonstrate the dissociative ionization of CHBrCl\({}_{2}\) molecules in an intense 800 nm femtosecond laser field. It is shown that the CHBrCl\({}_{2}\) molecules can be singly ionized and dissociate into low kinetic energy fragment ions, and such a process is further explained by the appearance energy of the fragment ions based on the ab initio calculations. However, the CHBrCl\({}_{2}\) molecules can also be ionized to multi-charged molecular ions and dissociate into high kinetic energy fragment ions by Coulomb repulsion.