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After dried by the hot-air dying, the vacuum drying and the vacuum freezing drying, the area shrinkage percentage of North Cordyceps was analyzed by the digital image processing technology, and combined the shearing and the crushing mechanic characteristics, the suitable drying technology was chosen. Considering the powder quantity percent passing through the 200 mesh standard sieve, the processing of the shearing method and the ball milling method were investigated, the optimal processing parameters of the dried North Cordyceps were confirmed. The results show that the area shrinkage percentage, the shearing stress and the crushing stress of the freeze-dried North Cordyceps are the smallest, so the vacuum freeze drying technology is chosen as the suitable drying treatment method. The optimal processing parameters of the shearing grinding are as follows: the grinding time is 3 min, the material filling rate is 25%, the material moisture content is 3%, under these conditions, the grinding efficiency is 68.5g/h, the energy consumption is 0.46kW·h/kg. The optimal ball milling parameters are as follows: the milling speed is 266r/min, the milling time is 60min, the medium filling rate is 23%, the material filling rate is 15%, under these conditions, the grinding efficiency is 36.5g/h, the energy consumption is 2kW·h/kg.