The methodology was the qualitative research, collecting data from 26 key informants with structured in-depth-interview by face-to-face in-depth-interviewing, analyzing data by the descriptive interpretation.

The Findings were as follows:

1. The factors affecting the religious property

management of monasteries in Ayutthaya Province were that 1.1 the factors affecting the religious property management was the management to yield welfares to the public and the public felt the loving–kindness according the Buddhadhamma 1.2 The controlling factors to control the religious property management of the monasteries by all parties concerned in the right ways 1.3 The factors of personnel appointment was to recruit personnel to help abbots look after and protect the religious property of the monasteries.1.4 The factors of inventory making was to make the lists of religious property and money of the monasteries. It was the basic principle to help abbots make decision about the appropriately and 1.5 The appropriate inventory was the form of account that the operators could make use of it These 5 factors were the basic needs the abbots used to manage the religious properties of the monasteries which was the art and science to get things done through others. Planning, interpersonal communications, directing and controlling the human and other resources were the appropriate ways to manage the religious properties in the same direction and to reach the set targets.

2. The general conditions of the religious property management of monastery in Ayutthaya Province : The monastery land management in Ayutthaya Province by overall, was suitable but lacked of correct advise, especially, the clear model plan and regulations for the religious property management should be systemized so that the abbots could follow immediately There are two models of religious property management of monastery in Ayutthaya province; 2.1 the Legal model of religious property management of monastery was the management by following the handbook of Buddhism Provincial Office in Ayutthaya Province, 2.2 the traditional model of religious property management of monastery was the management according to the practical traditions without the written documents. These two models had different approaches to the religious property management with the different benefits and problems depending on the areas.

3. The proposed models of development for the religious property management of monasteries in Ayutthaya Province were the steps of management process the abbots with the cooperation of personnel used to carry out the tasks, emphasizing the capacity, skill, needs, the hope for the progress in the study and management of the religious property of the monasteries to meet the set target. The five models of development for the religious property management of monasteries were, 3.1 the charity model that emphasized the public welfares according to the principle of loving-kindness to use the lands of monasteries for the most benefits, 3.2 the religious property control model that emphasized the flexible control and monitoring the religious property, 3.3 the assigned responsible personnel model that emphasized the recruitment of the appropriate personnel to be responsible for the management of the religious properties, 3.4 the inventory of the religious properties and money model that emphasized the documentation of inventories, lists and account by laws and 3.5 the appropriate document model that emphasized the suitable and practical lists and accounts that the personnel could apply and follow.