A simple user friendly mathematical modelling tool was developed on the basis of MATLAB software. The program system provides the possibility of solving differential equation system with the aid of an easy-to-use graphical surface. It is suitable for bioprocess engineering simulations to describe the dynamic behaviour of a great series of various enzyme, fermentation and environmental bioreaction systems. It is especially beneficial that non-time interventions can also be modelled and graphical representations can be realized on a wide palette.