Unsafe hidden danger of machine is found in time in the design phase and the design changes are carried on which is an effective and economic way to guarantee machinery safety. The purpose of implementing the risk evaluation of mechanical is to identify the risk, assessment and evaluation so as to eventually reduce the risk. Through analying the possible danger, danger state, dangerous events and damage occurred in press, according to the severity, exposure degrees, probability of occurrence of hazardous events and possibility of avoidance , the risk index was calculated using risk graph method. When the risk index was high，the risk reduction was adopted, and the risk would be evaluated after the reduction，then the essential safety of the press eventually was reached.