Combining geographically distributed and SCRUM methodology, analyze the decomposition process of product backlog, take out several vital factors: priority setting, team location, task stability, team difference and task workload estimation. Taking the method of questionnaire survey to collect data, and making regression analysis with SPSS to find the influence of factors to product backlog. It finds out that priority setting, task stability and task workload estimation have significant effect to the decomposition process of product backlog, as for team location and team difference, there aren’t obvious influence. And this research can help SCRUM team accomplish product backlog more efficient.