Increased purchasing decisions a service in the company's image and the trust
factor that is in the minds of the customers to a service company. Things that should
be considered is how to increase the purchasing decisions of procurement services in
the context of the promotion and improvement of quality of service so expect services
will increase the purchasing decision.
This study aims to describe and analyze the effect of the company's image,
trust, promotion and also the quality of service to the purchasing decision services.
To model the procurement of promotion and improving service quality corporate
image and moderating influence on purchasing decisions trust services.
In this study, the population is the entire customer service Post Office of
Palangkaraya city that the number is not known. The size of the sample used in this
study as many as 100 people. The method used in the selection of the sample used is
purposive sampling and the sampling technique used was accidental sampling. While
the analytical techniques used in this research is to use the concept of Structural
Equation Modeling (SEM) programs Partial Least Square (PLS).
From the results of data analysis can be concluded that: There is a significant
relationship between corporate image services to the purchasing decision. There is a
significant relationship between trust in the services purchasing decision. No
significant difference between the moderation of the corporate image-promotion
services to the purchasing decision. A significant difference between the moderation
of trust-promotion services to the purchasing decision. A significant difference
between the moderation of the corporate image-quality service to the purchasing
decision services. No significant difference between moderation trust-quality service
to the purchasing decision services.

Keywords: Corporate Image, Trust, Promotion, Quality of Service, Purchasing
Decision, Purchasing Decision Services, Post Offices