Pressure-resistivity relation of amorphous alloys (Fe1-xCox)77.5Nd4B18.5（０≤ｘ≤１．０） were investigated in detail in the hydrostatic pressure range from 0.0001 to 2.4 GPa. We obtained the variation rule of pressure coefficient of resistivity with content x in above amorphous alloys. Results show that substitution of a little Co(x=0.2) for Fe can not affect magnetic hardness and thermal stability, but enhance resistivity (about 28%)，and improve stability both of electrical and magnetic properties under high pressure. Moreover, structure relaxation were observed under 0.51GPa for 3-24 hours. Content x dependence of relaxation time of resistivity of the amorphous alloys under high pressure was studied.