Abstract: Based on the analysis of damper movement during load test period, a concept for the dissipation power of damper is suggested. Comparing with the traditional method using hysteretic loop, the method of dissipation power seems obviously more useful when assessing the capacity of dampercs power dissipation. After analyzing the difference of dampercs energy dissipation, between two waveshapes of a simple loop load test, a comprehensive method for the capacity assessment of dampercs power dissipation is suggested.