Multicomputer software system is presented. It implements a distributed solution of problems of dendroecological diagnostics. The architecture of the system includes calculation cluster and communication server, providing access to information on the dendroecology and to the instrumental means of analysis of annual tree rings, aimed at revealing the changes in the parameters of the environment in which the trees grew. The annual tree rings are simulated based on the key properties of radial tree growth, namely monotonicity of growth in space and time and finiteness of tree growth rate, while variations of wood density are considered as a spatiotemporal oscillation process.