This research is focus on solar cell industry, which is one of the major equipment supplies for solar cell manufacturing production, represent of solar sell equipment with four customers for this case study. This study uses a case analysis approach and aims to evaluate customer relationship performance from three technical service practices of equipment represent to their customers, solar cell manufacturing firms. Industry characteristics, Original supplies, problems, and competition pressures are considered between represent and customers. Probe into literature review and interviews with solar equipment represent and manufacturers, case analyses and research findings are provided. Consequently, two major management points are stated to provide viewpoints and suggestions that solar cell suppliers who offer superior technical services have sound advantage and to safeguard customer relationship performance effectively.