Self-noise from the rotor blade of the UH-1H Helicopter is obtained numerically by using the Brooks` empirical noise medel. All of the five noise sources are compared with each other in frequency domain. From the calculated results the bluntness nosie reveals dominant noise soursed at small angel of attack, whereas the separation noise shows main noise term with gradually increasing angel of attack. From the results of two diffent tip Mach numbers with the change of angel of attack, the OASPLs at M = 0.8 show about 15dB larger than those at M = 0.4.