According to the current relevant standards and specifications at home and abroad, this paper studies the acceptance tests which must be performed to validate whether the grid-connection/splitting process and grid-connection operation of the Microgrids meet the relevant technical requirements or not. Combining the technical requirements of the Microgrids, this paper gives the conditions, measuring instruments, general process and acceptance standards of the acceptance tests, and focuses on the designing of acceptance tests of key operation, operation parameters and protection functions of the Microgrids, such as grid-connection/splitting process, power quality during the grid-connection operation and reverse power and short-circuit protection, etc. The relevant test methods, specific steps and acceptance standards are proposed. This paper can provide a good foundation and basis for designing the acceptance tests specification of the Microgrids.