The paper is devoted to examining the effect of a reverse flow on a cascade of two nonadiabatic continuously stirred tank reactors (CSTR) connected with stream flow. A suitable numerical method was used to achieve data reduction, particularly in the region of transition between periodic oscillations and chaos. Computation results gave period doubling leading to chaos. Sensitivity to initial conditions has also been investigated. It has been shown that there is a dependence between oscillations of the cascade without reverse flow and dynamic phenomena, which can occur with flow reversal.