If the employer has not signed a labor contract with the employee, it may refer to the following documents when determining that there is a labor relationship between the two parties:
(a) payment vouchers or records (payroll), the payment of various social insurance premiums;
(2) Work Permit, Service Certificate and other documents that can prove the identity issued by the employer to the employee;
(3) Employment records such as Registration Form and Application Form filled out by employees;
(4) attendance records;
(5) Testimonies of other workers, etc.
Among them, the relevant documents in items (1), (3) and (4) shall be borne by the employer.