To solve the problem that the static service bill of material (service BOM

SBOM) cannot reflect the service process of dynamic maintenance

repair and overhaul (Maintenance

Repair and Overhaul

MRO) in real time

a SBOM evolution model in the product service life cycle for different management and service requirements in the dynamic MRO business is designed. By analyzing the difference of SBOM structure under the three management requirements of batch product

single product and single MRO service

from the perspective of assembly location

supplier and MRO tasks

the nodes and constraints of SBOM are classified and defined

and the evolution relationship model of different types of SBOM is established. Based on the influence of MRO service requirements on the changes of general SBOM and instance SBOM nodes

two types of SBOM changes in the dynamic service process and the node states under each type of changes are described

and the dynamic evolution model of SBOM changing with time is constructed. Finally

a locomotive bogie is taken as an example to prove the feasibility of the evolutionary model

and two MRO service traceability mechanisms are proposed according to the node traceability purpose

which greatly improves the management and traceability ability of dynamic data information in locomotive MRO service.