The invention discloses a vacuum 
electron beam brazed joint method of 
tungsten / low activation steel, belonging to the field of 
metal materials. According to the method, with an amorphous state T-based belt as 
brazing filler metal, the 
tungsten and the low activation steel are subjected to the brazed joint by using the vacuum 
electron beam braze technology wherein the amorphous state T-based belt contains 30-50 percent by weight of Ti, 30-50 percent by weight of Zr, 10-15 percent by weight of Cu and 5-10 percent by weight of Ni. During 
soldering, the scanning and the heating are carried out on the 
electron beam surface from the surface of the 
tungsten under the conditions that the temperature is controlled to 800-1,200DEG C, the work vacuum degree in the chamber is 1.0-5.0*10<-3>Pa, the accelerating 
voltage is 100-150KV, the focusing current is 100-600mA, the electron beam current is 1-10mA and the scanning frequency is 0.1-1KHz. The coil is scanned at 
high frequency by controlling through a computer and the 
heating time is 1-5 minutes. By using the method, the tungsten and the low activation steel are connected in a short time with high efficiency; and the 
weld seam interface can be better combined and has no defects of pore, inclusion, cracks and the like. The invention can be widely applied to connecting components of a 
helium cooled partial filter in a magnetic-confinement 
nuclear fusion experimental device.