A calculation method for the heat flux field based on the command value of heat flux density of several discrete points like the installation position of heat flux density sensor is present for prediction of heat flux field of quartz lamp array in the plane, cylindrical and conical shape at different moment in the thermal test. The equation set about the temperature of filament in every heating zone is established based on analytic method. The theoretical value of the temperature of filament in every heating zone is got according to the command value at some moment in the thermal load curve of every heating zone. Then the heat flux field can be calculated based on analytic method, which achieves to the prediction of the whole field of heat flux based on the command value of heat flux density of several discrete points. Comparing the results of heat flux field calculated from the analytic method with finite element software, the relative error of heat flux density of specified point is less than 0.5%. The distribution of heat flux field shows good agreement verifying the validity of the proposed calculation method. The test result shows the relative error between computed value and test value of heat flux density of specified point is less than 10%, which verifies the validity of the calculation method.