In this paper, we share our experience in information collection, management and online effective life calculation of tower crane. We propose a framework to complete collecting, classing, storing and processing of the working parameters of tower crane through wireless transmission and some commercial software, such as Visual Basic and SQL Server, based on the monitoring system of tower crane group. The load spectrum of tower crane can be gotten by numerical statement of above-mentioned information. Thus, the real-time effective life of tower crane is calculated and displayed directly through our algorithm. This life can be taken as a reliable reference in the safety detecting of tower crane. The effectiveness of the proposed method has been verified by a simple example of tower crane hoisting mechanism assessment. The results show that the system is accurate and reliable. The main advantage of the new method is its simplicity of implementation in lack of the load spectrum.