Model “YJHM” Drilling Jar belongs to the advanced product of model JYQ Jar. The up jarring can be acted by hydraulic as to realize the stepless tonnage control. The new hydraulic valve machine makes up-jarring more stable and reliable. The down jarring can be acted mechanically. And the adjusting mechanism designed specially can realize manual regulation of down-jarring tonnage; the special slips construction makes down-jarring more stable and larger service. It can adopt the new special material for higher property and safety. It can be used for directional hole, deep hole and so on.