Combustion chamber deposits are usually observed in various internal combustion devices. They result in negative effects on the operation and performance of these devices. Study of deposits formed in the internal combustion devices is not easy and usually time-consuming. Therefore, we proposed an experimental method to simulate the deposit formation on the combustion chamber wall by considering a spray flame impinging onto a stagnation plate. Using this method, deposits can be readily generated on the stagnation plate, and it is easy to extract them for further chemical or physical analysis. In this paper, we first focused on the gasoline deposits, and later on the diesel deposits, generated on the water-cooled stagnation plate. The comparisons of gasoline deposits from the stagnation spray flames and from actual CFR engine tests exhibited good qualitative correlations. Concerning the diesel deposits, they had great difference with the gasoline deposits in the appearance. However, the effect of the cooling water (the wall temperature) and deposit growth history for the diesel deposits were basically similar to those of the gasoline deposits. This method may be used as a preliminary test on understanding deposit formation or for fuel formula developing. However, further studies are needed to justify its applicability to real engine CCD simulation.