Zhongerzhong Ng5 is a multi-layer heavy oil reservoir in Gudao oilfield. There are two major productive layers, such as Ng53 and Ng54, in Ng5 formation. The commingling production and the steam overlap result in large production difference among oil layers in Ng5 formation. Therefore, the distribution of reservoir properties is more and more disequilibrium after multiround of steam stimulation. In this article, numerical simulation technology was employed to analyze distribution characteristics of reservoir properties,such as remaining oil saturation, remaining oil abundance, reservoir pressure and temperature, in multi-layer heavy oil after mature steam stimulation. The results show that high remaining oil saturation is mainly distributed in an area with less production wells. The remaining oil abundance is related to not only remaining oil saturation, but also effective thickness of reservoirs closely. The area of large remaining oil abundance is located in high position of reservoirs or is far from edge water zone. Until September 2011, the pressure level was only 42.93% and the average temperature rose about 2 ℃ in Ng5 formation. Based on the results of numerical simulation, we can provide a guide for the separate zone steam injection or steam flooding method to enhance oil recovery in multi-layer heavy oil reservoirs.