Abstract: Different shapes of solar chimney（SC）systems have different effects on the heat collection characteristics of the system. A10° circular SC numerical simulation model and a test bench were established. The comparision betweenthe numercial simulation and the test results showed that the relative error was less than 4%,which ensured the correctness of the model and numerical simulation method. The same numerical simulation method was used to calculate the 0° circle,0° square and 10° square SC models,and the results of different systems were compared. The results show that the uniformity of the surface temperature field of the absorber varies with different system structures,and the influence of the chimney shadow on the surface temperature field of the 10° square absorber is the least. Compared with the fluid velocity in the chimney,the 10° square has a higher velocity gradient,which is more conducive to determining the turbine position. The total enthalpy difference of the fluid in the chimney of different systems is different,and the total enthalpy difference of the 10° square is larger. Compared with the 0° circular SC system,the collector efficiency of the other three SC systems is increased by 11.328%,43.705% and 66.061%,respectively,and the mass flow rate is increased by 59.36%,8.39% and 39.04%.