The coking performance for the catalytic pyrolysis of heavy oil with temperature，weight ratios of catalyst －to－oil and steam－to－oil and residence time，was investigated in a confined fluidized bed reactor on catalyst CEP－1，with a special catalyst of catalytic pyrolysis process （CPP） technology．The coke content on catalyst decreases with the increase of the weight ratios of catalyst － to－oil and steam－to－oil and n（H）／n（C） of the feed，and it increases with the enhancement of reaction temperature and aromaticity of the feed．Coke yield increases with increasing reaction temperature，catalyst－to－oil weight ratio and aromaticity，while decreases with increasing steam－to－oil weight ratio and n（H）／n（C） of the feed．Both coke content and coke yield show minimum as residence time of oil gas prolongs．Both n（H）／n（C） and aromaticity of the feed can well reveal the coking tendency of a feed．On the basis of the experimental research，a correlation model of coke content and coke yield with feed property and reaction conditions was established．The parameters in the model were calculated by least square regression.

Based on CFD method, porosity and resistance coefficient was introduced to develop a mathematical model for radial-flow fixed-bed reactor (RFBR). The commercial CFD code FLUENT6.1 was applied to simulate the flow field in four kinds RFBRs with different flow modes. Some detailed information about the velocity and pressure distribution in these reactors was obtained. The simulated results show that most gases passed through the catalyst bed along the radial direction with the effect of bed resistance. The velocity distribution in the middle of the catalyst bed is approximatively uniform. The flow in outward RFBR is better than that in inward RFBR, and the flow in outward Π-shaped RFBR is better than that in outward Z-shaped RFBR. The axial non-uniformity in inward Z-shaped RFBR is maximum, then followed by inward Π-shaped RFBR, outward Z-shaped RFBR, and outward Π-shaped RFBR. The flow in outward Z-shaped RFBR is the most uniform.