Valuable historical gardens make a significant proportion of the peoples' urban heritage that has to be protected and conserved like heritage buildings, due to the deterioration, transgression, and damage these gardens suffer in different proportions. Each country has its criteria for inventorying its heritage historical gardens. The ultimate purpose is to observe, list, and determine the priorities of conservation and renovation. Therefore, the researchers found it necessary to set a model for selecting priority historical gardens for conserving such gardens and their heritage surroundings according to general, inclusive evaluation criteria. This model will be applied to some selected historical gardens to determine the priority garden for renovation. Results showed the priority of Azbakya Garden for renovation. It was followed by adopting the results of previous study to set a model design for Azbakya renovation by specifying the ideal tools for conserving the garden and its heritage surroundings and taking into consideration the current site design determinants, as well as respect for contemporary activities to set design ideas for the garden design proposal. Then, the researchers measured the extent to which the Azbakeya Garden renovation design proposal achieves conservation principles using previous model through a survey introduced to experts. Results showed the model has achieved a high percentage of conservation principles. This implies the possibility of applying the same to other heritage gardens.