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While the zoom lens cameras are increasingly used in various areas of computer vision, to accurately inform the relationship between the zoom values and the internal parameters is especially important. A parameter model using the function between zoom values and the internal parameters is proposed to express the relationship of them. In order to improve the calibration speed and reduce the manual intervention in different zoom state, servos driving manipulator is used and its movement is flexible controlled in accordance with the calibration process by the program. After a series of discrete parameter values are calibrated by Zhang zhenyou’s calibration algorithm, three different functions are used to fit the curve of the values, and fitting effect and error are also compared. Through the proposed method, parameter model of the zoom lens can be established which can provide accurate parameter information for further visual analysis.