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Based on the methods of acquaintance cache and group-based intelligent forwarding of service recommendations, a novel group-based active service (GAS) protocol for migrating workflows was proposed. This protocol did not require service requesters to discover services or resources. The semantic acquaintance knowledge representation was exploited to describe service groups and this semantic information was used to recommend service to respective clients. The experimental results show that the new protocol proposed offers better performance than other protocols in terms of first-response-time, success-scope and ratio of success-packet-number to total-packet-number. When the number of service request packet is 20, the first-response-time of GAS protocol is only 5.1 s, which is significantly lower than that of other protocols. The success-scope of GAS protocol is 49.1%, showing that GAS protocol can effectively improve the reliability of mobile transactions. And the ratio of success-packet-number to total-packet-number of GAS protocol is up to 0.080, which is obviously higher than that of other protocols.