The employers can revoke the labour contracts at any moment should any one of the following cases occur with its labourers: (1) where they are proved during probation periods to be unqualified for employment; (2) where they seriously violate labour disciplines or the rules or regulations of the employer; (3) where they cause great losses to the employer due to serious dereliction of duties or engagement in malpractices for selfish ends; (4) where they are brought to hold criminal responsibilities in accordance with law; and/or (5) where other cases stipulated by laws and regulations occur.