The security check for baggage are tightened when leaving from Beijing
According to Beijing Capital International Airport Authority, The below items are prohibited when carried as checked baggage from Beijing.
Electronic devices(PC, tablet-type device,cell phone,etc),lithium ion battery (including mobile battery), portable charger for electronic devices,etc.
In case of any violation of related regulations, the prohibited items (including any suspicious items) will be removed. Please note that passengers themselves will bear any possible risk, such as impossible transport of baggage on the same flight and/or any damage to their baggage.