The paper presents some methodological problems concerning modeling of the processes of accumulation and prevalence of the pathological states caused by head injury in the population. The trend in the number of annual cases of new injuries of the head is estimated for at least 10 years for different age groups of the population. The average indices are estimated together with the limits of their fluctuations. Taking into consideration the mean expectation of life both the average annual quantity of the individuals with head injury in the anamnesis and probability of their accumulation are determined. This index equals to 22.22 per 1000. The frequency of the craniocerebral traumas was estimated in comparison with the total quantity of head injuries: 18.7 +/- 3.18% for children; 38.6 +/- 3.97% for the adults.