Abstract: in order to study the major parameters of accumulator affected to control haracter o ful section hydraulic belt broken protection device and the rapid and stable catching characterstic offerent pre-nfaton pressure and allcation type accunulator method was appied to analyze the comprehensive perormances of the hydraulic bet broken protection device. with the establishment of bladder type accurmulator mathematical mod e an ANME5Sin software was appled to anajze the vanation of speed and pressure during the catching proc.ss of the hydrauli belt broken protection device under the diferen parameters an l.cation and the impact on the absoption effect of the pressure impact Meanwhile a relevant est was conducted on th simulation 'est platiom according to the above sinmulaton resuts.The resulis showed tat the pre-infratio pressure of the accumulator would have a high infuenceto the pressure peak of the ful sction rydrauli belt boken potection deviceand would have lessinfluence to the catchin time. n comparison with the single paral accumulatortwo accumulators app ied woul havebetea absopio fe to:he pressure impact of hydraulic system.