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Combined the task,developing tendency and challenge of forensic toxicology,a new subject of forensic toxicology,forensic toxicokinetics,has been proposed in this paper,in which there are the concept,objective,task,research object,research contents,research method,research directions and problems to solve.The research contents include the toxicokinetics,postmortem distribution,postmortem redistribution,postmortem diffusion and toxic decomposition kinetics of forensic poisons.Through the forensic toxicokinetics research,many problems in the medicolegal expertise of poisoning can be solved,for instance,how to conclude the concentration of poison in the corpse when the death happened,how to conclude the concentration of poison in the organism when the accident take placed,how to distinguish the poisons which were given before the death or produced after the death,how to identify the poisons which were given before or after the death,how to determine the time,way and form by which the poison enters the body.